Bara no Maria

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 the story of love, friendship, and adventure of the beautiful "Cracker", Maria Rose.