Oyako to Mukaeru Asa wa 3 Toji, a young man confined to his home, lives with his brother, his brother’s wife, Keiko, and their daughter, Haruo. Driven by an insatiable curiosity about Keiko’s sex life, Toji secretly installs a hidden camera in her room to spy on them. However, both Keiko and Haruo discover his secret. Instead of reprimanding him, the mother and daughter seduce him, drawing him into a forbidden and unrestrained relationship with both. Oyako to Mukaeru Asa wa 5 Kozue Komuyu, Haruo’s classmate and a former student of Toji’s from when he was her tutor, visits the house to see him. Upon arriving, she witnesses a shocking scene that causes her to faint. When she regains consciousness, she sees Toji, Keiko, and Haruo engaged in sex. Keiko confronts her, forcing her to make a crucial decision. Gathering her courage, Kozue joins them in their whirlwind of desire.
