Haruka is a mother with a husband who is busy with work and a reclusive son. Her husband refuses to be involved in raising their child, so Haruka struggles to somehow rehabilitate her son, Satoru. Meanwhile, Haruka notices a change in Satoru. Now of puberty, he Haruka obscene way... However, not wanting to deny Satoru any more, Haruka accepts his feelings. When she takes a bath, she shows off her beautiful body, and when she masturbates, she offers up her wet genitals in a lewd manner. She has no idea that this stimulation awakens Satoru's further desires...