He's Reincarnated As A Demon's Servant But Is Secretly The Strongest Sword's Hero | Anime Recap
Ryousuke Kaga, an ordinary boy who only has one dream in mind which is to see every girls special talents. When one day Ryousuke finds a girl named Lisara who pretended to be weak in order to get him under her control. She reveals that she's actually a Grim Reaper Demon,. who was summoned into this world to take care of souls and find "The One"
However, Ryou's life takes a even worser turn when he finds out that he only has a couple of months to live and Lisara promises to save his life if he helps with her mission. But as time passes Ryou never realized that he also possessed one of the strongest powers from another world.