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He was initially Ichikawa Kyoutarou and Yamada Anna's classmate in Class 2-3, but moved to a different class from them in the following year (Class 3-2).
Personality.
Adachi is a brash and perverted teenage boy, but he has a strong sense of male honor. He is unapologetically perverse about and even around women.
Along with Kanzaki and Oota, he often engages in conversations involving shallow sexual desires, and occasionally tries to rope other classmates into somewhat perverted jokes/pranks, although he often gets called out before he gets his desired result.
Adachi can be surprisingly observant of other people. He recognized all the times Ichikawa got in his way back when he tried hitting on Yamada, and he realized that Ichikawa had grown closer with her over time. He is also the only one who recognized and genuinely appreciated Sekine's kind act of making chocolates for all the male students in class, despite him initially misunderstanding the chocolate he received to be romantic.
Adachi is also a social person who enjoys the presence of his friends, often being the one to start conversations.
Trivia.
Adachi is part of the judo club in middle school alongside Oota Chikara.[source]https://bokuyaba.fandom.com/wiki/Adachi_Shou[/source]