JUX-391 Today, I'm going to rape my brother's wife. Hamasaki Mao.

Junpo, a practicing physician, and his wife, Mao, are living happily together. One night, Junpo's younger brother, Shin'go, suddenly shows up at the Hamasaki residence. 'He's a free spirit, so just leave him alone,' Junpo casually brushes it off, contrasting with Mao, who is anxious and can't suppress her unease due to Shin'go's behavior. This is because Shin'go knows about Mao's past secret. Mao's anxiety begins to manifest in reality. 'You don't want your brother to find out about your past, do you?' Mao is threatened by Shin'go...