Risa, a female college student, becomes a tutor in a father-son household. The son is quiet, but he is aroused by Risa's body. The father has the same desire for a young body. The son and his bad friends put Risa to sleep with drugs, use her as a flesh doll for pleasure, and insert their penises to enjoy pleasure. The father finds out that he and his friends are using Risa as a toy every day, but the father also enjoys Risa's young body.