The first time Riku visits his friend’s home, he falls for his friend’s mother, Rika. Her voluptuous, huge-titted body has a mature allure no adult classmate could match. Unable to admit why he is so interested in her, Riku makes up an excuse to leave the room and eagerly goes looking for Rika. He does not even need to speak to her; he simply wants to be near the woman he admires. But when he quietly opens a door, he catches Rika in an unexpectedly lewd act.