Goodbye, See Ya

Overview

He was all alone, until he found his savior... Rei has eternal life by feeding on the energy of other beings. He's not human and the only way for him to become mortal is to find his "soulmate"... As all of his fellow beings find their partners and die along with them, he's been alone now for hundreds of years without ever finding his soulmate. But, when he meets the wealthy and carefree Yuto, Rei begins to feel something that he's never felt before... (Source: Renta!)

Source: AniList