I finally got around to reading the first volume of 'Dear Door' after seeing it pop up everywhere, and I've gotta say the setup is pretty wild even by my standards. It starts with this grim reaper, I think his name is Plutus, who gets tricked into a supernatural contract that basically turns him into a spirit real estate agent? He has to exorcise ghosts by finding them new spectral tenants for the haunted spaces they're clinging to. The main plot revolves around him trying to sever this contract with a powerful demon king named Lucifer, which of course involves a lot of forced proximity and escalating deals.
Where it gets really spicy is the dynamic—it's not your typical enemies-to-lovers, it's more like cosmic-scale blackmail-to-lovers. Plutus is all duty and repressed angst, while Lucifer is pure chaotic, flirtatious energy, and the power imbalance is off the charts. The plot drives their relationship forward through these exorcism cases that keep revealing more about the spirit world's politics and their own cursed pasts. Honestly, the lore gets denser than I expected, with angels, other demons, and a whole hierarchy of hell getting involved in their messed-up romance.