Monkess Lucia is being humiliated/injured.

It’s a place where men are prohibited from entering. This is the Holy Maria Anna Women’s Monastery. Here, nuns serve God and pray with devotion. But it was also a place where there were many women who couldn’t stand having to live with such strict rules. One day, a young woman named Rumiko came to this monastery. Rumiko was just an ordinary high school student. But she was shocked when she saw her father, Otsuki, and her tutor, Mizukawa, loving each other. Her mother also became hospitalized due to the shock she suffered. Filled with hatred, Rumiko decided to seduce Mizukawa in his bed, while he was asleep. It was a planned act, done to take advantage of the time when her father would be away from home.