かつて滅びた死者の街。そこには豪快な骸骨の剣士、ブラッド。淑やかな神官ミイラ、マリー。偏屈な魔法使いの幽霊、ガスに育てられる少年ウィルがいた。死者の街に秘められた謎。神々の愛と慈悲。偏執と狂気。その全てを知る時、少年は聖騎士への道を歩みだす。
William is the lone human in a city of the dead. Born with vague memories of a past life and raised by a group of undead, William must discover what circumstances brought him to this city and these people as well as what it means to not just exist, but to live a full life.