Unidentified Crypt Heart

Unexplored pleasures, hunting, and dangerous love. Dangerous ecology of an unidentified young lady!?
What appears before Mashima Yuma, a straight-laced and serious high school student, is a super sadist and sexual master who hunts down unidentified creatures UMA that appear with the mist, and a super super masochistic and talented maid. Will his new life in the town of memories be filled with joy, pain, and rose-colored days?