The official Twitter account for Hobby Japan’s HJ Bunko imprint has confirmed that Amamiya Kazuki’s 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 has been green-lit for an anime adaptation.
[https://x.com/HJbunko/status/1939700459993727005]
Hobby Japan published Amamiya’s first novel in December 2021, with illustrations by Gin. The novel series won the grand prize in the HJ Novel Award in 2020, and the series’ ninth novel was released on July 1st, 2025.
J-Novel Club releases the novel series in English under the name Haibara’s Teenage New Game+, and it published the eighth novel on June 20th, 2025. J-Novel Club describes the 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 from June 2023 to August 2024 in Hobby Japan’s Comic Fire, and manga artist Comochiya started a sequel manga in December 2024 titled Haibara-kun no Tsuyokute Seishun New Game: Ame ni Utareru Kimi ni Kasa o Sasou.
