Haibara's Teenage New Game+ (Japanese: 灰原くんの強くて青春ニューゲーム, Hepburn: Haibara-kun no Tsuyokute Seishun Nyū Gēmu) 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.
Contents
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
Natsuki Haibara (灰原 夏希, Haibara Natsuki)
Voiced by: Yūto Uemura
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.
Hikari Hoshimiya (星宮 陽花里, Hoshimiya Hikari)
Voiced by: Kanon Takao
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.
Miori Motomiya (本宮 美織, Motomiya Miori)
Voiced by: Kanna Nakamura
Natsuki's childhood friend.
Uta Sakura (佐倉 詩, Sakura Uta)
Voiced by: Aya Yamane
Yuino Nanase (七瀬 唯乃, Nanase Yuino)
Voiced by: Sayumi Suzushiro
Hikari's childhood friend.
Tatsuya Nagiura (凪浦 竜也, Nagiura Tatsuya)
Voiced by: Ryōta Suzuki
Reita Shiratori (白鳥 怜太, Shiratori Reita)
Voiced by: Tomohiro Ōno
Serika Hondo (本堂 芹香, Hondo Serika)
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 "Dramatic Tōhikō" (ドラマチック逃避行; 'Dramatic Runaway Trip'), performed by Aimi. Crunchyroll is streaming the series.
Reception
The series won the grand prize at the HJ Novel Award in 2020.