Ruri lived a peaceful family life with her kind, caring husband and their adorable son Ken. However, she harbored a secret she could never reveal to anyone—the heartbreaking incident that had occurred between her and her son Ken. She had convinced herself it would happen only once, but Ken didn't seem to feel the same. Even with her husband nearby, Ken approached Ruri and began fondling her large, voluptuous breasts. Though she tried to resist, Ruri gradually found herself overwhelmed by rising emotions.