bold sister

Natsumi and Jiro live with their brother and sister due to their father's work. Natsumi is a 28-year-old office lady who loves drinking canned beer after taking a bath. However, he can't cook and is clumsy, so Jiro always supports him, but he doesn't pay attention to him and has a crush on his boss at work. However, things like that can't last forever, and one day Natsumi ends up heartbroken. Then, when she returns home drunk, she pushes down Jiro, who greets her, and begins to lewdly play with his younger brother, who has confessed to him that she is a virgin.