- Ayumu is a student who is full of erotic things but is not popular in the shadows. One day, I saw Ranka, a black gal who lives in the same apartment and is rumored to be a spearman, giving a to a man while masturbating on the stairs of the apartment, and I involuntarily took a voyeur with my smartphone, but it seems that I was caught voyeurizing, and later I was ambushed on the stairs and taken to Ranka's room.