My younger sister, Sana, was looking forward to an on-the-job experience, but was unable to participate because she was sick. Sana was depressed about it. For the sake of his cute little sister, Yuma, her older brother, decides to buy her a cosplay costume and play the job experience at home. I can't help but get an erection because of the naughty costume, so I ask my innocent younger sister to take care of it...♡