The Long Summer of August 31st

The Long Summer of August 31st
First tankōbon volume cover
8月31日のロングサマー
(Hachigatsu Sanjuuichi no Rongusamā)
Genre
Manga
Written byIkkado Ito
Published byKodansha
English publisher
ImprintMorning KC
MagazineMorning
Original runMarch 30, 2023 – present
Volumes13

The Long Summer of August 31st (Japanese: 8月31日のロングサマー, Hepburn: Hachigatsu Sanjuuichi no Rongusamā) is a Japanese manga series written and illustrated by Ikkado Ito. It began serialization in Kodansha's seinen manga magazine Morning in March 2023.

Synopsis

Takaya Suzuki and Kana Takagi are high schoolers who have been caught in an unending time loop centered around the date August 31st for a month. Suzuki begins to suggest that a possible reason for this could be linked to Suzuki's desire to get a girlfriend and lose his virginity.

Publication

Written and illustrated by Ikkado Ito, The Long Summer of August 31st began serialization in Kodansha's seinen manga magazine Morning on March 30, 2023.[3] Its chapters have been compiled into thirteen tankōbon volumes as of August 2026.[4]

The series is published in English on Kodansha's K Manga app.[5] The series is also licensed for English publication by Seven Seas Entertainment.[6]

Volumes

No. Original release date Original ISBN North American release date North American ISBN
1August 23, 2023[7]978-4-06-532668-8April 1, 2025[8]979-8-89373-174-3
  1. "August 31st on Loop" (ループする8月31日, Rūpu suru Hachigatsu Sanjūichinich)
  2. "Ordering a Parfait on August 31st" (パフェを頼む8月31日, Pafe o Tanomu Hachigatsu Sanjūichinichi)
  3. "LINE Messages on August 31st" (LINEする8月31日, LINE Sūru Hachigatsu Sanjūichinichi)
  4. "At the Pool on August 31st" (プールする8月31日, Pūru suru Hachigatsu Sanjūichinichi)
  1. "Invited Out on August 31st" (かよばれする8月31日, Kajobare suru Hachigatsu Sanjūichinichi)
  2. "Out of Control on August 31st" (暴走する8月31日, Bōsō suru Hachigatsu Sanjūichinichi)
  3. "Running like the Wind on August 31st" (疾走する8月31日, Shissō suru Hachigatsu Sanjūichinichi)
  4. "Devised a Plan on August 31st" (計画する8月31日, Keikaku suru Hachigatsu Sanjūichinichi)
2November 22, 2023[9]978-4-06-533664-9July 8, 2025[10]979-8-89373-175-0
  1. "Being Fashionable on August 31st" (おしゃれな8月31日, Oshare na Hachigatsu Sanjūichinichi)
  2. "Planning for the Future on August 31st" (進路する8月31日, Shinro suru Hachigatsu Sanjūichinichi)
  3. "Back to the August 31st Part 1" (バック・トゥ・ザ・8月31日 PART I, Bakku tu za Hachigatsu Sanjūichinichi PART I)
  4. "Back to the August 31st Part 2" (バック・トゥ・ザ・8月31日 PART II, Bakku tu za Hachigatsu Sanjūichinichi PART II)
  1. "Back to the August 31st Part 3" (バック・トゥ・ザ・8月31日 PART III, Bakku tu za Hachigatsu Sanjūichinichi PART III)
  2. "Practicing on August 31st" (練習する8月31日, Renshū suru Hachigatsu Sanjūichinichi)
  3. "Karaoke on August 31st" (カラオケする8月31日, Karaoke suru Hachigatsu Sanjūichinichi)
  4. "August 31st Will Always Come Part 1" (きっとくる8月31日その壱, Kitto Kuru Hachigatsu Sanjūichinichi Sono Ichi)
3February 22, 2024[11]978-4-06-534649-5November 4, 2025[12]979-8-89373-540-6
  1. "August 31st Will Always Come Part 2" (きっとくる8月31日 その弐, Kitto Kuru Hachigatsu Sanjūichinichi Sono Ni)
  2. "August 31st Will Always Come Part 3" (きっとくる8月31日 その参, Kitto Kuru Hachigatsu Sanjūichinichi Sono San)
  3. "Coed on August 31st" (共学する8月31日, Kyōgaku suru Hachigatsu Sanjūichinichi)
  4. "The Final Battle on August 31st Part 1" (決戦は8月31日 PART 1, Kessen wa Hachigatsu Sanjūichinichi PART 1)
  1. "The Final Battle on August 31st Part 2" (決戦は8月31日 PART 2, Kessen wa Hachigatsu Sanjūichinichi PART 2)
  2. "The Final Battle on August 31st Part 3" (決戦は8月31日 PART 3, Kessen wa Hachigatsu Sanjūichinichi PART 3)
  3. "The Final Battle on August 31st Part 4" (決戦は8月31日 PART 4, Kessen wa Hachigatsu Sanjūichinichi PART 4)
  4. "Going on a Trip on August 31st Part 1" (旅行する8月31日 PART 1, Ryokō suru Hachigatsu Sanjūichinichi PART 1)
4May 22, 2024[13]978-4-06-535579-4February 3, 2026[14]979-8-89373-768-4
  1. "Going on a Trip on August 31st Part 2" (旅行する8月31日 PART 2, Ryokō suru Hachigatsu Sanjūichinichi PART 2)
  2. "Going on a Trip on August 31st Part 3" (旅行する8月31日 PART 3, Ryokō suru Hachigatsu Sanjūichinichi PART 3)
  3. "Going on a Trip on August 31st Part 4" (旅行する8月31日 PART 4, Ryokō suru Hachigatsu Sanjūichinichi PART 4)
  4. "Going on a Trip on August 31st Part 5" (旅行する8月31日 PART 5, Ryokō suru Hachigatsu Sanjūichinichi PART 5)
  5. "Going on a Trip on August 31st Part 6" (旅行する8月31日 PART 6, Ryokō suru Hachigatsu Sanjūichinichi PART 6)
  1. "Going on a Trip on August 31st Part 7" (旅行する8月31日 PART 7, Ryokō suru Hachigatsu Sanjūichinichi PART 7)
  2. "Going on a Trip on August 31st Part 8" (旅行する8月31日 PART 8, Ryokō suru Hachigatsu Sanjūichinichi PART 8)
  3. "Going on a Trip on August 31st Part 9" (旅行する8月31日 PART 9, Ryokō suru Hachigatsu Sanjūichinichi PART 9)
  4. "An August 31st Without You" (君がいない8月31日, Kimi ga Inai Hachigatsu Sanjūichinichi)
5August 22, 2024[15]978-4-06-536597-7May 12, 2026[16]979-8-89373-965-7
  1. "Under the Tree of Legend on August 31st" (伝説の樹の下で8月31日, Densetsu no Ki no Shita de Hachigatsu Sanjūichinichi)
  2. "Screams Ring Out on August 31st" (絶叫する8月31日, Zekkyō suru Hachigatsu Sanjūichinichi)
  3. "A Sweaty August 31st" (汗をかく8月31日, Ase o Kaku Hachigatsu Sanjūichinichi)
  4. "An Important August 31st" (大事な8月31日, Daijina Hachigatsu Sanjūichinichi)
  1. "Barbecue on August 31st" (焼肉する8月31日, Yakiniku suru Hachigatsu Sanjūichinichi)
  2. "To the Manga Café on August 31st" (漫喫する8月31日, Mankitsu suru Hachigatsu Sanjūichinichi)
  3. "A Long Phone Call on August 31st" (長電話する8月31日, Nagadenwa suru Hachigatsu Sanjūichinichi)
  4. "That Summer of August 31st Part 1" (あの夏の8月31日 PART 1, Ano natsu no Hachigatsu Sanjūichinichi PART 1)
6November 21, 2024[17]978-4-06-537523-5August 25, 2026[18]979-8-89561-454-9
  1. "That Summer of August 31st Part 2" (あの夏の8月31日 PART 2, Ano natsu no Hachigatsu Sanjūichinichi PART 2)
  2. "That Summer of August 31st Part 3" (あの夏の8月31日 PART 3, Ano natsu no Hachigatsu Sanjūichinichi PART 3)
  3. "That Summer of August 31st Part 4" (あの夏の8月31日 PART 4, Ano natsu no Hachigatsu Sanjūichinichi PART 4)
  4. "That Summer of August 31st Part 5" (あの夏の8月31日 PART 5, Ano natsu no Hachigatsu Sanjūichinichi PART 5)
  5. "That Summer of August 31st Part 6" (あの夏の8月31日 PART 6, Ano natsu no Hachigatsu Sanjūichinichi PART 6)
  1. "That Summer of August 31st Part 7" (あの夏の8月31日 PART 7, Ano natsu no Hachigatsu Sanjūichinichi PART 7)
  2. "That Summer of August 31st Part 8" (あの夏の8月31日 PART 8, Ano natsu no Hachigatsu Sanjūichinichi PART 8)
  3. "That Summer of August 31st Part 9" (あの夏の8月31日 PART 9, Ano natsu no Hachigatsu Sanjūichinichi PART 9)
  4. "That Summer of August 31st Part 10" (あの夏の8月31日 PART 10, Ano natsu no Hachigatsu Sanjūichinichi PART 10)
7February 21, 2025[19]978-4-06-538473-2November 10, 2026[20]979-8-89561-983-4
  1. "That Summer of August 31st Part 11" (あの夏の8月31日 PART 11, Ano natsu no Hachigatsu Sanjūichinichi PART 11)
  2. "That Summer of August 31st Part 12" (あの夏の8月31日 PART 12, Ano natsu no Hachigatsu Sanjūichinichi PART 12)
  3. "That Summer of August 31st Part 13" (あの夏の8月31日 PART 13, Ano natsu no Hachigatsu Sanjūichinichi PART 13)
  4. "That Summer of August 31st Part 14" (あの夏の8月31日 PART 14, Ano natsu no Hachigatsu Sanjūichinichi PART 14)
  1. "That Summer of August 31st Part 15" (あの夏の8月31日 PART 15, Ano natsu no Hachigatsu Sanjūichinichi PART 15)
  2. "That Summer of August 31st Part 16" (あの夏の8月31日 PART 16, Ano natsu no Hachigatsu Sanjūichinichi PART 16)
  3. "That Summer of August 31st Part 17" (あの夏の8月31日 PART 17, Ano natsu no Hachigatsu Sanjūichinichi PART 17)
  4. "That Summer of August 31st Part 18" (あの夏の8月31日 PART 18, Ano natsu no Hachigatsu Sanjūichinichi PART 18)
8May 22, 2025[21]978-4-06-539526-4——
  1. "That Summer of August 31st Part 19" (あの夏の8月31日 PART 19, Ano natsu no Hachigatsu Sanjūichinichi PART 19)
  2. "That Summer of August 31st Part 20" (あの夏の8月31日 PART 20, Ano natsu no Hachigatsu Sanjūichinichi PART 20)
  3. "That Summer of August 31st Part 21" (あの夏の8月31日 PART 21, Ano natsu no Hachigatsu Sanjūichinichi PART 21)
  4. "That Summer of August 31st Part 22" (あの夏の8月31日 PART 22, Ano natsu no Hachigatsu Sanjūichinichi PART 22)
  1. "That Summer of August 31st Part 23" (あの夏の8月31日 PART 23, Ano natsu no Hachigatsu Sanjūichinichi PART 23)
  2. "That Summer of August 31st Part 24" (あの夏の8月31日 PART 24, Ano natsu no Hachigatsu Sanjūichinichi PART 24)
  3. "That Summer of August 31st Part 25" (あの夏の8月31日 PART 25, Ano natsu no Hachigatsu Sanjūichinichi PART 25)
  4. "Consulting on August 31st Part 1" (相談する8月31日 PART 1, Sōdan suru Hachigatsu Sanjūichinichi PART 1)
9August 22, 2025[22]978-4-06-540614-4——
  1. "Consulting on August 31st Part 2" (相談する8月31日 PART 2, Sōdan suru Hachigatsu Sanjūichinichi PART 2)
  2. "Consulting on August 31st Part 3" (相談する8月31日 PART 3, Sōdan suru Hachigatsu Sanjūichinichi PART 3)
  3. "Becoming a Family on August 31st Part 1" (家族する8月31日 PART 1, Kazoku suru Hachigatsu Sanjūichinichi PART 1)
  4. "Becoming a Family on August 31st Part 2" (家族する8月31日 PART 2, Kazoku suru Hachigatsu Sanjūichinichi PART 2)
  1. "Becoming a Family on August 31st Part 3" (家族する8月31日 PART 3, Kazoku suru Hachigatsu Sanjūichinichi PART 3)
  2. "Becoming a Family on August 31st Part 4" (家族する8月31日 PART 4, Kazoku suru Hachigatsu Sanjūichinichi PART 4)
  3. "Becoming a Family on August 31st Part 5" (家族する8月31日 PART 5, Kazoku suru Hachigatsu Sanjūichinichi PART 5)
  4. "Becoming a Family on August 31st Part 6" (家族する8月31日 PART 6, Kazoku suru Hachigatsu Sanjūichinichi PART 6)
10November 21, 2025[23]978-4-06-541440-8——
  1. "Becoming a Family on August 31st Part 7" (家族する8月31日 PART 7, Kazoku suru Hachigatsu Sanjūichinichi PART 7)
  2. "Becoming a Family on August 31st Part 8" (家族する8月31日 PART 8, Kazoku suru Hachigatsu Sanjūichinichi PART 8)
  3. "Becoming a Family on August 31st Part 9" (家族する8月31日 PART 9, Kazoku suru Hachigatsu Sanjūichinichi PART 9)
  4. "Becoming a Family on August 31st Part 10" (家族する8月31日 PART 10, Kazoku suru Hachigatsu Sanjūichinichi PART 10)
  1. "Becoming a Family on August 31st Part 11" (家族する8月31日 PART 11, Kazoku suru Hachigatsu Sanjūichinichi PART 11)
  2. "Becoming a Family on August 31st Part 12" (家族する8月31日 PART 12, Kazoku suru Hachigatsu Sanjūichinichi PART 12)
  3. "Becoming a Family on August 31st Part 13" (家族する8月31日 PART 13, Kazoku suru Hachigatsu Sanjūichinichi PART 13)
  4. "Becoming a Family on August 31st Part 14" (家族する8月31日 PART 14, Kazoku suru Hachigatsu Sanjūichinichi PART 14)
11February 20, 2026[24]978-4-06-542536-7——
  1. "Becoming a Family on August 31st Part 15" (家族する8月31日 PART 15, Kazoku suru Hachigatsu Sanjūichinichi PART 15)
  2. "Becoming a Family on August 31st Part 16" (家族する8月31日 PART 16, Kazoku suru Hachigatsu Sanjūichinichi PART 16)
  3. "Becoming a Family on August 31st Part 17" (家族する8月31日 PART 17, Kazoku suru Hachigatsu Sanjūichinichi PART 17)
  4. "Becoming a Family on August 31st Part 18" (家族する8月31日 PART 18, Kazoku suru Hachigatsu Sanjūichinichi PART 18)
  1. "Becoming a Family on August 31st Part 19" (家族する8月31日 PART 19, Kazoku suru Hachigatsu Sanjūichinichi PART 19)
  2. "Becoming a Family on August 31st Part 20" (家族する8月31日 PART 20, Kazoku suru Hachigatsu Sanjūichinichi PART 20)
  3. "Becoming a Family on August 31st Part 21" (家族する8月31日 PART 21, Kazoku suru Hachigatsu Sanjūichinichi PART 21)
  4. "Becoming a Family on August 31st Part 22" (家族する8月31日 PART 22, Kazoku suru Hachigatsu Sanjūichinichi PART 22)
12May 22, 2026[25]978-4-06-543589-2——
  1. "Becoming a Family on August 31st Part 23" (家族する8月31日 PART 23, Kazoku suru Hachigatsu Sanjūichinichi PART 23)
  2. "Becoming a Family on August 31st Part 24" (家族する8月31日 PART 24, Kazoku suru Hachigatsu Sanjūichinichi PART 24)
  3. "Becoming a Family on August 31st Part 25" (家族する8月31日 PART 25, Kazoku suru Hachigatsu Sanjūichinichi PART 25)
  4. "Becoming a Family on August 31st Part 26" (家族する8月31日 PART 26, Kazoku suru Hachigatsu Sanjūichinichi PART 26)
  1. "Becoming a Family on August 31st Part 27" (家族する8月31日 PART 27, Kazoku suru Hachigatsu Sanjūichinichi PART 27)
  2. "Becoming a Family on August 31st Part 28" (家族する8月31日 PART 28, Kazoku suru Hachigatsu Sanjūichinichi PART 28)
  3. "Becoming a Family on August 31st Part 29" (家族する8月31日 PART 29, Kazoku suru Hachigatsu Sanjūichinichi PART 29)
  4. Koi o suru Hachigatsu Sanjūichinichi (恋をする8月31日)
13August 21, 2026[4]978-4-06-544731-4——

See also

References

  1. ↑ 8月31日を何度も繰り返す男女…恋と真っ向から対峙する青春タイムループコメディ. Comic Natalie (in Japanese). Natasha, Inc. August 23, 2023. Retrieved February 3, 2025.
  2. 1 2 "Series: The Long Summer of August 31". Seven Seas Entertainment. Retrieved February 3, 2025.
  3. ↑ Cayanan, Joanna (March 30, 2023). "I'm Not Meat's Ikkado Ito Launches New Manga". Anime News Network. Retrieved February 3, 2025.
  4. 1 2 8月31日のロングサマー（13） (in Japanese). Kodansha. Retrieved August 11, 2026.
  5. ↑ Hazra, Adriana; Tai, Anita (September 12, 2024). "Kodansha's K MANGA Platform Adds The Long Summer of August 31st, Chaos Game Manga in English". Anime News Network. Retrieved February 3, 2025.
  6. ↑ Tai, Anita (October 9, 2024). "Seven Seas Licenses Fairy Cat, Sex Drive, The Long Summer of August 31, 4 More Titles". Anime News Network. Retrieved February 3, 2025.
  7. ↑ 8月31日のロングサマー（1） (in Japanese). Kodansha. Retrieved February 3, 2025.
  8. ↑ "The Long Summer of August 31 Vol. 1". Seven Seas Entertainment. Retrieved February 3, 2025.
  9. ↑ 8月31日のロングサマー（2） (in Japanese). Kodansha. Retrieved February 3, 2025.
  10. ↑ "The Long Summer of August 31 Vol. 2". Seven Seas Entertainment. Retrieved February 3, 2025.
  11. ↑ 8月31日のロングサマー（3） (in Japanese). Kodansha. Retrieved February 3, 2025.
  12. ↑ "The Long Summer of August 31 Vol. 3". Seven Seas Entertainment. Retrieved May 6, 2025.
  13. ↑ 8月31日のロングサマー（4） (in Japanese). Kodansha. Retrieved February 3, 2025.
  14. ↑ "The Long Summer of August 31 Vol. 4". Seven Seas Entertainment. Retrieved August 12, 2025.
  15. ↑ 8月31日のロングサマー（5） (in Japanese). Kodansha. Retrieved February 3, 2025.
  16. ↑ "The Long Summer of August 31 Vol. 5". Seven Seas Entertainment. Retrieved August 15, 2025.
  17. ↑ 8月31日のロングサマー（6） (in Japanese). Kodansha. Retrieved February 3, 2025.
  18. ↑ "The Long Summer of August 31 Vol. 6". Seven Seas Entertainment. Retrieved March 20, 2026.
  19. ↑ 8月31日のロングサマー（7） (in Japanese). Kodansha. Retrieved February 3, 2025.
  20. ↑ "The Long Summer of August 31 Vol. 7". Seven Seas Entertainment. Retrieved April 25, 2026.
  21. ↑ 8月31日のロングサマー（8） (in Japanese). Kodansha. Retrieved April 11, 2025.
  22. ↑ 8月31日のロングサマー（9） (in Japanese). Kodansha. Retrieved July 12, 2025.
  23. ↑ 8月31日のロングサマー（10） (in Japanese). Kodansha. Retrieved November 2, 2025.
  24. ↑ 8月31日のロングサマー（11） (in Japanese). Kodansha. Retrieved February 9, 2026.
  25. ↑ 8月31日のロングサマー（12） (in Japanese). Kodansha. Retrieved April 12, 2026.
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