Jagi ga Kuru!

is a Japanese light novel series written by Toshio Tani. The series began publication on August 10, 1996 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
Beyond the millennium, the "heavenly evil spirit" revives in Japan at the end of the century! It is also the "cecum" of the ordinary boy, Shiomi Jyo. Jyo, who was reborn as a priest, Sanjoin Hatsuho, who once sealed the evil demon in space, falls into the trouble of taking care of the evil demon, guided by causality. However, when Jyo prioritizes a sweet relationship with his girlfriend Momoko over the evil demon, the evil demon turns into a monster that sucks the evil thoughts of humankind. The evil demon that spread the plague EVI, which has the worst mortality rate in history, heads for Shinjuku Shinjuku while steadily becoming huge.