Over the course of the school year, ten different girls will fall in love with Senpai. If Senpai is a male, his name is Taro Yamada, and if she is a female, her name is Taeko Yamada. The player is given the option of choosing Senpai's gender at the beginning of the game they might be 'Senpai-kun', or they might be 'Senpai-chan'. In Yandere Simulator, the title of 'Senpai' is given to the young man (or young woman) that the protagonist is infatuated with. If you start working at a new job, any co-worker who has been employed at the workplace longer than you is your 'senpai'.
For example, if you are a first-year student, all second-year and third-year students are your 'senpai'.
The Japanese word 'senpai' refers to someone who has seniority over someone else.