The story shifts when Ryuuki's friends introduce him to the world of adult videos, specifically featuring a popular new streamer named (also spelled Kiryl). While typically uninterested in such content, Ryuuki finds himself inexplicably drawn to Kiriru. Episode 1 reaches its climax when Ryuuki, seeking privacy in a remote location (often described as an abandoned warehouse or forest), is shocked to find the real Kiriru appearing before him. Key Characters and Relationships
Produced by , a studio known for adult-oriented content, the animation is noted for its high quality compared to many of its peers.
Ryuuki’s childhood friend who harbors a secret crush on him, adding a layer of romantic tension to the story. Production and Themes
(The Summer the Boy Became an Adult) marks the debut of a 4-episode animated series based on the 2023 manga by Jairou. Released in September 2024 by Queen Bee , the first episode introduces a story that blends a standard coming-of-age narrative with adult themes, centered on the life of a young student named Ryuuki Kirishima. Plot Overview: A Summer of Awakening
The OVA series consists of four episodes, originally released on the following timeline:
Ryuuki’s older sister. Though she is a chemical genius, she is portrayed as a "genius slob"—brilliant at her work but messy and plain at home.
A popular adult streamer with a mysterious connection to Reiko. The story hints that Kiriru may be a "useful mask" or alter ego created by Reiko through scientific means to live out her urges without social consequences, mirroring the themes of Dr. Jekyll and Mr. Hyde .
A talented football (soccer) prodigy whose world revolves around his sister until this pivotal summer.
Shounen ga Otona ni Natta Natsu (OVA 2024) - MyAnimeList.net