She was an ordinary Tanmei college student, but some blind "relative" traveled halfway around the world to kick her from her ordinary college life to that shitty ghost's house where she learned something about catching ghosts and killing ghosts. In fact, she just simply held a gun and used different bullets to shoot at ghosts. Sometimes she really couldn't understand why her classmates spent so much time there.
Also, I don't know which nameless kid always likes to come out at night and scare her. The most disgusting thing is that he later stopped even during the day. He either drove her to school or urged her to sleep. In the end, he actually didn't even let her read her cute pornographic articles. Damn it!