Young wife Kanae Wakana's problem has been that her underwear has been stolen recently. Not knowing who the culprit is, Kanae is unable to suppress her arousal at her brother-in-law's house where she is staying, and in her favorite lingerie she seduces her husband and has sex with him while still in her underwear! One day, she uses her karate skills to catch a man trying to steal her panties, but it turns out that the culprit is her brother-in-law! She threatens her brother-in-law, who is an underwear fetishist, and makes him lick her whole body like a butter dog, then has sex with him in the cowgirl position! She reaches a climax of pleasure as a large amount of semen is poured on her underwear!