Grim Ember, a heart bestowed upon those whose lives were claimed by the sea, is granted only if the Abyss God, who is residing in the murky depths, wills it. The heart grants its master a new chance to walk on the surface of the earth. But as God's love is not unconditional, the wielder must set out on a journey to fulfill the Abyss God's wish, and only if you succeed, your new life is yours to keep. Or at least, so was promised.