It is a manga by Ougi Yuzuha, part of a collection ( https://www.mangaupdates.com/series.html?id=132619)
Seen the raws, it looks promising ლ(´ڡ`ლ)
Actually it probably got serialization... I am not too sure as mu Japanise is almost non existent, but it seems there was 2nd chapter published in magazine this month... so its probably a series now
MANGA???
http://www.mangago.me/read-manga/kobi_no_kyoujin/mf/v02/c013.8/4/