Maougun Saikyou no Ore, Konkatsushite Bishoujo Yuusha wo Yome ni Morau
魔王軍最強のオレ、婚活して美少女勇者を嫁に貰う
Lido, one of the Four Heavenly Kings, enters the human world to fulfill a command from the Demon Lord. While gathering intelligence on heroes, he visits a marriage agency and meets Rena, a hero who is also his childhood first love. Neither recognizes the past connection, and they agree to a marriage of convenience for strategic reasons. They intend to maintain separate lives while benefiting from each other’s strengths. The arrangement is meant to be purely functional, with no emotional involvement.