Living with her father-in-law, who recently retired, Tsubasa finds herself relying on him for help while her husband is busy with work. But beneath his seemingly kind demeanor, the old man harbors an uncontrollable lust. Entranced by Tsubasa's unsuspecting beauty and her big tits, he begins secretly leering at her, craving to touch her body. One day, he pretends to trip and fall—an obvious trap. As Tsubasa rushes to support him, he smirks deviously and pulls her into a tight embrace…!?