Once gods and men had lived together, fought assailing enormous fiends together. The young boy Tsuchimaru felt powerlessness in the state of humans only being able to be protected by gods, but one day, his life was changed by a vagrant artisan and the the sword he had created...

かつて神と人は、共に生き、共に襲い来る巨大な魔獣と戦っていた――。少年・ツチマルは、神に守られる人間という存在に無力感を抱いていたが、ある日、流れ者の職人がつくった一振りの剣によって人生が変わる……。