Yuu likes to masturbate, and usually uses her favorite vibrator to satisfy herself, hiding it from her family. Today, after seeing her family off, Yuu is about to have some fun when a sudden tragedy strikes. Unfortunately, a robber breaks in. "Ma'am, you shouldn't be masturbating without noticing the robber," the robber says with a smirk as he approaches Yuu, who is blushing with shame...