Maki Koizumi is a woman, her husband unfortunately died of a serious illness, which made her extremely heartbroken and did not intend to take more steps. Despite being old, Koizimu looks quite young and has a smooth white skin. Due to long contact with men, emotional deprivation is inevitable. Because of this reason, every time her grandchildren came to play, she always solicited, teaching them to make love to satisfy her needs and help young boys become more mature in love.