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.

Living isn't easy.

When Haruhito awakens, he's in the dark. He doesn't know where he is, why is he here, and where he came from. Around him there are several men and women who have the same circumstances.

Together, they advance forward away from the darkness, and a world they've never seen before called "Grimgar" spreads out before them.

Memories, money, special powers — this is the reality we who have none of those things have obtained.