Yoshinomi hates her mother's new partner to death. Her mother is away from home for three days, leaving her with a strained relationship. Just as the two of them begin to live a terrible life together, her stepfather suddenly goes out of control. He mixes an aphrodisiac into his food and seduces his stepdaughter without her knowledge. Sweaty nighttime rape, squirting and toy training, and a sex threesome with a stranger she found on a bulletin board... Eventually, Yoshinomi too