Lido, the mightiest among the Four Heavenly Kings, ventures into the human realm under the Demon Lord's command, aiming to strip the hero of his powers using magic. While on a mission to gather intelligence on the heroes, he stumbles upon a matchmaking agency. Here, he encounters Rena, a stunning girl who happens to be a hero as well. Surprisingly, Lido and Rena discover that they shared a childhood romance. Oblivious to their shared history, they enter a strategic marriage solely for practical gains, intending to maintain separate lives despite their union. Their matrimony serves as a facade to the world, showcasing formidable combat prowess but lacking any trace of affection or love!