Mitsuki, a little sister, is not good at talking to strangers and feels embarrassed when she is seen. However, when she starts cosplaying, which she loves, she becomes very proactive as if she has become a different person. Today, she is going to have a cosplay photoshoot with her brother and his friend, but the atmosphere gradually becomes lewd, and she is penetrated in the pussy, her dick is twisted deep inside her vagina, and she climaxes while shaking her whole body.