DxD: Milking System

A single soul floating in the endless void met a girl who called herself Lady Luna. She offered him a new life in exchange of telling her an interesting story of his adventure. The soul is reincarnated into a strange world as the twin brother of Hyoudou Issei. Not to mention he have an interesting system to help him to survive. [You drink a mouthful of milk. As a result, your lifespan increased by 3 Days. You gained 3 EXP] [You have gained skill: Water Magic.] He will get stronger by drinking milk! Follow him as he conquer the milk in DxD world!