Exactly what it says in the tin, Since my plot takes place in Japan and I don't want to Yandere simulator this.
My main knowledge of Japan is anime and manga (which isn't how Japan actually works), Useful notes from TvTropes on Japan and some articles on people who live in or visit Japan
For context from my story: It's about a guy who's planning to become a cop, goes to an unusual boarding school and is unaware that there's a game that basically captures the flag with him as the flag, another guy is pretending to be his friend to win the game and to protect him then he slowly fall in love with him.
So any help would be useful =)