Mirai, who has been raising her son Aoi alone, was dumped as soon as she introduced him to his girlfriend. Mirai's son tries to comfort Mirai by drinking alcohol, but when Mirai notices that his son's penis is erect, she can't help but take her son's penis in her mouth, due to her bad drinking habits. Since then, the mother-son incest between Mirai and her son has escalated...