Yui Saito is Hideki's teacher who watches over him and the girls and becomes their club's advisor. She gives him advice on how to interact with girls and balance his gaming life. It is later revealed that she was the LA player Nekohime (猫姫), a catgirl who rejected Hideki's in-game proposal two years prior, stating that she was actually a guy.
In school, Yui is a hard-working and strict teacher that cares deeply for her students. Yui doesn't like it when they are doing something that is against the school rules or when they are acting out. Despite that, Yui wants nothing, but to help them and feel better in school. In the game, however, Yui acts more childish, cheerful to the point that some would mistake her for a teenager. Yui is known to be wise and understanding at young people, knowing how to handle them and treat their problems in a positive way.
