Tatsuya returns home after a long absence. At her house was Natsume, the second wife of her father who had remarried without her realizing it. Tatsuya is suspicious of Natsume's youth and beauty, which does not match her father. Natsume indulges in an affair with her father's men, as expected. Tatsuya is closing in on her evidence. Tatsuya tramples her young and supple body. While she resists, she falls into the pleasures of young people's violent sex.
