DxD: Ink and summoning

After dying in a hospital, our Mc wants to enjoy his new life to the fullest. What can you do with the Longinus Annihilation maker, a great imagination, the legacy of a certain painter and a system that lets you summon characters you knew in you past life? Carrying problems from the past, finding new ones on this world or summoning them from another world What changes would he bring to this new world? I do not own the cover. Dxd or any of the summoned characters. English is not my main lenguage.