Remaining Life Chasing Darkness

It is set that monsters that appear in the night will come to the kingdom of the dark night called the Kingdom of Shadows whenever they come to a specific time. There is a monster named Dark in the Kingdom of Shadows. The Kingdom of Shadows is invading reality. At this moment, a mysterious organization called the Dark Exterminator appears. Ordinary weapons have no effect on Darkness. Only people who have awakened to Yao can fight against Darkness.