The 11th and final novel in the Haibara-kun no Tsuyokute Seishun New Game (Haibara’s Teenage New Game+ / 灰原くんの強くて青春ニューゲーム) light novel series by Amamiya Kazuki was released on June 1st, 2026.
[https://x.com/amamiya5235/status/2061045432776839608?s=20]
The 11th novel is the conclusion to the main story, and Amamiya previously stated that there would be a 12th novel, which would include an epilogue.
Hobby Japan published Amamiya’s first novel in December 2021, with illustrations by Gin, and the novel series won the grand prize in the HJ Novel Award in 2020. The series’s 10th novel was released in April 2026.
J-Novel Club releases the novel series in English under the name Haibara’s Teenage New Game+, and it published the ninth novel digitally in February 2026. J-Novel Club describes the novel story below:
“We all have embarrassing memories or deep regrets from high school, right? Socially anxious college senior Natsuki Haibara sure does. When he thinks back on that time of his life, all he has are fleeting fantasies of a happy adolescence that could have been. Imagine his bewilderment and surprise, then, when he inexplicably finds himself seven years in the past—one month before his first year of high school! Can Haibara avoid his previous mistakes, make his way to the top of the school social pyramid, and end up with the girl of his dreams? Or will he be forced to relive three years of solitude as the most hated guy in school? He’ll need all the help he can get in order to succeed, from a workout regimen to online how-to guides, a childhood friend, and plenty of sheer willpower. Watch as Haibara takes a second shot at his teenage years!”
Manga artist Misaomaru adapted the novels into a manga with the same name, from June 2023 to August 2024, in Hobby Japan’s Comic Fire. Hobby Japan released the manga’s first tankoubon volume in August 2025, and the third volume digitally in February 2026.
The manga received a sequel story by manga artist Comochiya in December 2024. The manga sequel titled Haibara-kun no Tsuyokute Seishun New Game: Ame ni Utareru Kimi ni Kasa o Sasou is serialised in Hobby Japan’s Comic Fire.
The novel series received a TV anime adaptation in April 2026. The anime is available to stream on the Crunchyroll website under the title Haibara’s Teenage New Game+.
[https://www.youtube.com/watch?v=grtTFII_FAU]
