Tsubaki agreed to live in a two-family household with her clueless father-in-law. However, this was all part of her father-in-law's scheme. His clumsy act was merely a ploy to seduce her. When the father-in-law says, "Koyode, it's been a while, how about it?" Tsubaki can't outright reject him and ends up feeling pity, thinking that letting him touch her breasts isn't such a big deal. His advances escalate, and though Tsubaki eventually resists, it's already too late—she's forcibly taken against her will. Her body, starved of intimacy due to a sexless marriage with her husband, gradually becomes drawn to her father-in-law. Despite overwhelming guilt, Tsubaki sinks deeper into the pleasures of his big-dick sex.