Crossover: Transmigrating into Demon Slayer as a Shrine Maiden

The story of Demon King Tanjiro meeting the shrine maiden Yan Fei from the Land of Flowers, then going to great lengths to become the Demon King and successfully abducting a famous beauty. Both the male and female leads are nonhuman. A crossover with the original settings, including but not limited to Demon Slayer, Hozuki's Coolheadedness, Inuyasha, Haruka: Beyond the Stream of Time, Onmyoji (not the mobile game), and Nura: Rise of the Yokai Clan.

Theme: I want Tanjiro, so I'm giving everyone their happy ending.