Kanojo no Ai ga Omosugite Tsurai

Mitsuya is a high school student raised in a religious household after his father became a priest following his mother's infidelity. He adheres to Christian teachings and avoids worldly desires, as his father hopes he will become a priest. His childhood friend Hanako, whose family owns a local confectionery, invites him to her home. Her family has changed their business to a sex shop to adapt to economic challenges. Hanako recalls a childhood promise of marriage and presents a ring made from aluminum foil. She suggests that, according to Christian beliefs, any intimate act should only occur within marriage, implying that if she were to act inappropriately, he would be obligated to marry her.