HELP THIS REMINDE ME OF THESE GACHA HISTORIES

Rui was a cold demon that no one understood. he treated everyone the same - as if they were nobody. He thought he had no heart for anyone, but he was wrong. when he met a gentle snd delicate angel named Tsukasa, he found out that his heart was soft.

hell and heaven was so away from each other. you could only get across a long bridge that took days of walking, but that didn't stop Rui and he walked it quite often to meet his angel.