Manbiki, Dame. Zettai!! Seiso na Manbiki Joshi Class Zenin 2 Hon Sashi! Double ω Keikaku

Akio works at a convenience store. Yukio, his younger brother, always comes to his store after work. He is actually a teacher at a girls school. What they do is... to punish girls who committed shoplifting.... One day, Yumi comes to the store and looks for a toilet. Yukio takes her to the toilet and secretly puts an article for sale into her bag.... When she comes out, Akio stops her and checks her bag....

(Source: ErogeShop)