is a Japanese light novel series written by Kazuki Amamiya and illustrated by Gin. It began publication under Hobby Japan's HJ Bunko light novel imprint in December 2021. A full-colored vertical manga adaptation illustrated by Misaomaru was serialized on Hobby Japan's Comic Fire manga website from June 2023 to August 2024, with a sequel illustrated by Comochiya beginning serialization on the same website in December 2024. An anime television series adaptation produced by Studio Comet aired from April to June 2026.
Plot Natsuki Haibara, a fourth-year university student, was planning for his life after graduation when he is suddenly transported back in time. He finds himself seven years in the past to when he was a first-year high school student. As he has retained memories and skills from his university life, he aims to relive his high school days and deal with his past regrets, including becoming friends with his former crush Hikari Hoshimiya.
Characters
A university student who is sent back to the past and is now reliving his high school life. He had many regrets in his previous life and aims to avoid the mistakes he made before.
A beautiful high school student that Natsuki crushed on when he was in high school. In his new life, he befriends her, and though she is unaware of his feelings for her, she still comes to care for him.
Natsuki's childhood friend.
Hikari's childhood friend.
Miori's classmate and a member of the Music Club.
Media Light novel Written by Kazuki Amamiya and illustrated by Gin, Haibara's Teenage New Game+ began publication under Hobby Japan's HJ Bunko light novel imprint on December 1, 2021. Eleven volumes have been released as of June 1, 2026. The series ended its main story in its eleventh volume, and will release an epilogue. The series is licensed in English by J-Novel Club.
Manga A full-colored vertical manga adaptation illustrated by Misaomaru was serialized on Hobby Japan's Comic Fire manga website from June 16, 2023, to August 29, 2024. Its chapters have been compiled into three digital volumes as of February 2026.
A sequel illustrated by Comochiya began serialization on the same website on December 19, 2024.
Anime An anime adaptation was announced by the HJ Bunko X account on July 1, 2025, which was later confirmed to be a television series that is produced by Studio Comet and directed by Misuzu Hoshino, with series composition handled by Keiichirō Ōchi, characters designed by Hiromi Ono, and music composed by Sōnosuke Takao. The series aired from April 3, 2026 to June 19, 2026, on TBS and other networks. The opening theme song is "Fly Again!!", performed by Ami Maeshima, while the ending theme song is , performed by Aimi. Crunchyroll is streaming the series.
Episodes
Reception The series won the grand prize at the HJ Novel Award in 2020.
See also Rebuild World, another light novel series with the same illustrator
Notes
References
External links