The protagonist, Youta, has a woman whom he trusts and respects the most―― His mother, Kawachi Shiori.
Unlike his workaholic father who doesn’t care about his family, Shiori is very family-oriented and has been fond of Youta for a long time. In contrast to her husband who is always on long-term business trips, Shiori has been taking care of their house and Youta without any complaint. In her heart, however, she is tormented by stress due to her loneliness and not being able to have sex anymore.
Drowning in lust, the story of a pitiful mother and a son falling into the depths begins..