From Greener (jcafe24):
Shibaki is a high-school boy whose only interest is girls. Except he's been branded as the most hentai boy at school and the girls avoid him like the plague. But not long ago he found a book in the library about how to summon witches. He tries it as a joke, but then a cute witch named Rurumo appears to grant him a wish. Shibaki helps Rurumo and she in return refuses to take his soul.
One day on a "Mission" from his senpai he thinks back , and wishes he could see Rurumo again. His wish is granted immediately as Rurumo falls from the sky and crash lands in front of him. Tasked of getting Shibaki to use up 666 magic tickets that grant wishes before she can become a witch again. However according to Rurumo's familiar , what she doesn't know is that each time he uses a ticket it shortens his life and when the last ticket is used up, he will die. What will hentai Shibaki do!