Protagonist of the game is a rounin.

In Japan, a rounin is a student who has graduated from middle school or high school but has failed to enter a school at the next level, and consequently is studying outside of the school system for entrance in a future year.

[From Wikipedia]

Though the term is based on ancient samurai, do not use it for games featuring a masterless-samurai. Use Samurai Protagonist on those instead.