Aunt Mari, a relative, secretly seduces me

As a final refresher before the exam, Kyosuke decided to go to Comiket (a manga sale event) held in the countryside. By chance, when she found out that the event would be held near her mother's sister, Mari, she asked Mari to stay for a week when Comiket is being held. And on the day, Kyosuke is surprised whenever he sees Mari. In fact, Mari looked very similar to Kyosuke's favorite anime character, "Witch Goddess Lady Romano." Then Kyosuke couldn't get Mari out of his mind for a long time...