Hikari lives separately from her husband and suffers from a sexless life. One day she witnesses her daughter being intimate with her boyfriend and something stirs inside her. During her daughter’s absence, the boyfriend returns to pick up something he forgot. He confesses he has always been interested in her and can no longer hold back. His adolescent desire explodes as he exposes her big breasts and tempting body. Although she resists, telling herself she must not climax, she is made to orgasm so embarrassingly many times that she ends up betraying her daughter and repeatedly having sex with him.