Mariarose, a boy always being mistaken for 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 on an "Underground Raid", but things aren't as easy as they seem...

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