Bullied by classmates for being the only virgin, Ken decides to confide in his mother, Jun. Desperately, he pleads, "Please, Mom... teach me about women." Moved by her son's sincerity, Jun reluctantly lifts her skirt to show him her panties, saying, "Now you can brag to your friends, but this is just for looking, okay?" Still failing to grasp his true feelings, she doesn't anticipate what happens next. Seeing the thick patch of pubic hair clearly visible through her panties, Ken becomes aroused and impulsively reaches out. That single moment of passion changes their relationship forever.