Mad Miniscape manga volume 1 features story and art by Ayumu Hirose.

Asahi is an ordinary girl who shares a small apartment with the boy she grew up with, Minoru. Which wouldn't be all that strange, except... Minoru died four years ago. The 'thing' that occupies Asahi's apartment is nothing like her childhood friend - it's inhuman, grotesque, and keeps demanding Asahi's life at every opportunity. But Asahi doesn't mind. As long as Minoru is there with her, absolutely nothing else matters... right?