USOTSUKI FUUFU NO AYAKASHI KONIN JIJOU: DANNA-SAMA WA SAIKYOU NO AMANOJAKU!?

Due to certain circumstances, Reona has zero romantic intelligence and lives solely for her work. Seeing her plight, her cousin secretly arranges a blind date, only to find her boss, Amano, shows up. And what's more, he's a "half-demon with a mischievous spirit"—what?! "This is a deal. You're in trouble, aren't you? Because of that curse." Their fake married life begins, but Amano's tsundere behavior is unpredictable... "I love you, my bride." "That's a lie, husband." This is the story of two liars who become a real married couple. (Source: Ichijinsha, translated) — Description from AniList community (anilist.co).