Years after marrying a divorced man with a child, Nozomi impulsively downloads a dating app one day. The person she matches with turns out to be her stepson—a fact she didn't initially realize. Even after discovering the truth, her body refuses to pull away, and she ends up engaging in a sexual relationship with him. Terrified of her husband finding out, she nevertheless becomes addicted to the thrill. Nozomi's lustful desires ultimately destroy the Hazuki family from within.