Sabbat of the Witch

The two of them had nothing to do with one another beyond just being classmates, until one day, when Shuuji stumbled upon a scene that defied his wildest imaginations.

Following that one accident, two strangers became friends. They bonded with one another through their shared secrets, and from this, Shuuji came to learn about certain things.

That is, not only about the reason for Nene's random 'fits' where she gets uncontrollably aroused, but also about the existence of people called 'witches'----

Nene's secret actions as a 'witch', and the 'fits' she goes through because of that serving a