From Iskultrip Scans and Manga Abyss:
Maria Rose, a boy always mistaken as a girl, is burdened with debt after a strange event, and his sword, "Fake Consuming Inferno" is confiscated. At that time, Katari, a member of his clan, got a hold of some profitable information, but to obtain it, they have to go to an "Underground Raid", but things aren't as easy as it seems...
This is…