Vampire Hunter: The legendary Van Helsing. In order to save people, he is also a vampire who tonight beat this way and that. "Gag" Battle of vampire hunter VS over over a century!

By Pink Rose Scans:
This is the tale, where the progress of senior high-school reorganization is accompanied by declining birth rate,
where survivors are on the line, in regards of the reformation of their precious school
challenged to increase the number of their students, This is the epic story picturing
The Student Council of Baddoun High fights of youth.

From Dan of Population GO:

Three friends, Kotori, Yuuto, and Rin are trapped in school when the principal halfheartedly summons a horde of demons. The demons make a pact with each student in exchange for possessing them. Most of the students wished to be be good looking or to have longer legs, but Yuuto manages to stave off the possessed student body while Rin overpowers the weak demon possessing her. Yuuto makes a pact with a demon to return the school to normal, but what will happen to the school now that each student is being possessed by a demon?