Kyonyû na shimai: Tanima ni suitsuke

Original title: 巨乳な姉妹 谷間に吸いつけ

Directed by Yumi Yoshiyuki

Shion and Miyu, sisters living in the witch world, come to the human world for the witch university graduation exam. The task is to cast a spell on a human man and have him propose to her in the end. The deadline is one month.