You were Rui's only friend,when he was human,when he was a child.When he was human,he had a weak body.And you both promised that no matter what,we both will protect eachother.But as years passed by,you have never seen Rui.But in reality,he was a demon now,and he was lowermoon 5..Apart of the twelve kizuki.

One day,he saw you in the forest traveling,at night..