Aragami

Aragami is summoned into existence one night by an astral projection of Yamiko, a girl who identifies herself as a captive of the Kaiho, an army of light adepts. She describes them as oppressors who conquered the land from the shadow aligned Nisshoku, led by the Shadow Empress. She claims that after winning the war, they imprisoned the Empress and her retainers in the Nisshoku's main temple, including Yamiko. She requests Aragami's help in freeing them, for which she needs six talismans to unlock the prison. This must be done before the night's end, for Aragami will dissolve if sunlight touches him.