OBA-261 My cousin Mari Aoi who secretly tempts me

Kyosuke decides to go to Comiket (manga sale event) held in a rural area as a last refreshment before the exam. She happened to find out that the Comiket was being held near her mother's older sister Mari's house, and her mother asked Mari to let her stay for a week while Comiket was being held. And on that day, Kyosuke is surprised every time he sees Mari. In fact, Mari looks a lot like Kyousuke's favorite anime character, "Witch God Lady Romano". And Kyosuke, who can't get Mari out of her head...