Mikakunin-kei Crypto Heart

is a Japanese manga series written and illustrated by Kotarou Mori. The manga was serialized in the Dengeki Daioh magazine and published in Japan by ASCII Media Works under the Dengeki Comics NEXT imprint from November 2014.

Synopsis
In front of a straightforward and serious high school student, Yuma Mashima, a super masochistic master who hunts unidentified creatures [UMA] that appear with fog and a super masochist maid. Is your new life in the town of memories a pleasure, anguish, and rosy days?

(Source: KADOKAWA Official Website - Translated)