Saikyou Eiyuu to Muhyoujou Kawaii Ansatsusha no Love Love Shinkon Seikatsu

Eldo, the strongest hero who defeated the Demon King, has finished his last mission and retired with his partner and lover, Chloe, the strongest assassin in the underworld. And so begins their newlywed life! However, the two, who have been fighting all their lives, don't know how to make out with each other...?