After losing his father, Kenichi lives with his mother Shinobu. One afternoon, Kenichi noticed that Shinobu was wearing a T-back. 'My usually plain and unsexy mother, why?' Pretending to leave the house, Kenichi scouted around inside and witnessed his mother having sex with her lover! 'Mom is an insatiable woman! She's betraying my dead old man and me!' Complex emotions he had never experienced before began to stir in Kenichi's heart...
