"Succubus Yondara Haha ga Kita!?" follows Morita Takashi, a high school student with a strong libido who wants to lose his virginity but struggles due to his lack of popularity with girls. After learning about a ritual that requires abstaining from masturbation for 72 days to summon a succubus, Takashi successfully summons one—only to be shocked when the succubus turns out to be his own mother. Despite the awkward situation, the succubus named Eri eventually succumbs to temptation, leading Takashi to experience his first sexual encounter in an unusual and provocative scenario.