One day, Mitsuki, a high school girl who lives with her mother and her son, loses her apartment key.She ends up living with her mother's key in a mailbox for a week until a spare one is available, but the man who lives next door watches her every step of the way.The man steals her key and breaks into Mitsuki's room, enjoys the smell of the schoolgirl, and then puts medicine into the food in the refrigerator.A man licks Mitsuki's small nipples while she falls asleep, and licks her pussy, which has a youthful scent.After leaving the room without leaving any traces, the man repeatedly invades Mitsuki and finally inserts his cock into Mitsuki's wet pussy...