Black magic was cast by Yandere Imari-kun

Summary

I'm a guy and she's a girl, but why?　Rintaro is accompanying his lonely childhood friend Imari in her occult club activities. A strange magic circle is drawn in the science lab after school... What is today's activity, black magic?　When he realizes, what should be there is gone, and the flat areas have become bulky...?　This is the start of an occult love comedy with a little bit of XX and a reversal of genders!