Mizuho who lost her husband in an accident for two years For her young widow her fatherinlaw Honma asks her to find a good person but she is worried that when she leaves only she her second son Cozy and a man remain The day Cozie brought home his girlfriend Hitomi Mizuho who was attracted by the groans in his room to peek into the sex of the two Eventually she begins to seduce her master and fatherinlaw to let go of the bond of reason