A girl in a gym uniform returns home from outside, stepping into a lifeless room and cheerfully greeting a man she calls "big brother," revealing they are siblings. With no parents around, they survive in poverty on welfare. Despite being of working age, the brother refuses to work, lazing around while forcing all housework and cooking onto his younger sister, making him a complete failure. Though the sister feels partially responsible, she silently allows him to do as he pleases. As a result, his degeneracy worsens, and he begins using her as an outlet for his sexual desires. One day, the brother's friend casually visits. He's shocked to see the girl in her gym uniform wearing a collar, but to the brother, it's just an ordinary sight. The brother announces he's going out to buy lunch, and despite having a rare visitor, he leaves without changing his routine. The friend is initially confused, but his attitude shifts instantly when told he can do whatever he wants with the sister. He eagerly asks her to buy his lunch too, then happily sends the brother off. Once the brother leaves, the friend starts acting on his desires just as permitted. The girl, who dislikes being touched by anyone other than her brother, resists, but the friend tightens his grip, telling her, "What I say goes, just like what your big brother says." Helpless and trapped, the girl can only endure as the friend's lust rapidly escalates...
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