Do You Want My Nutrient Solution Too?

Haruo, the youngest child of the Wagatsuma family, died while hunting demons. He became a demon. Yet he gained a Blood Demon Art capable of saving people. "Haruo." "Haruo...!" Who's crying as they call his name? Come to think of it, there does seem to be a boy in his memories who dressed terribly and was always crying. His voice was shrill and grating, but somehow not annoying. But "My brother is a poor guy with black hair, not a golden-haired crybaby like you." Crybaby Zenitsu: "...I really am your brother, Haruo!!!" Happy times are so brief, but the pain of loss lasts forever. After defeating Muzan, Haruo became a ruthless Demon King. With a snap of his fingers, he reduced every evil demon to ash. Then, as the last demon in the world, he began his lonely journey. He gave up on becoming human again. He possessed a Blood Demon Art that could heal anything, yet he had failed to save anyone. He didn't deserve to walk beneath the sun. A strange traveler has appeared in Suribachi City recently. He carries a gold-hilted sword in a white scabbard and only comes out at night. He always seems cold and distant, yet he'll save people without asking for anything in return. ...It's just that everyone he saves turns weird afterward. They all become mindless King fanboys, howling every day about wanting to drink "His Majesty's nutritional supplements"?? After everyone around him had switched sides, one future die-hard King fan finally couldn't take it anymore. He captured Haruo and demanded to know what he was after. Having figured out the situation in Suribachi City, Haruo, the current Demon King with no followers, calmly replied, "For now, I suppose I'll become the King of Suribachi City." The current King of the Sheep: "?" "Then I'll take over the port, eliminate the Special Division, and unite Yokohama." "?!" "Tokyo is the closest place and could get in the way, so next I'll get rid of Gojo." "??!" "Since I've made it this far, I might as well become the new King of Japan." "Huh?!?!" [Reading Guide]: 1. The protagonist is a demon. He has never eaten anyone, only drunk blood. 2. The protagonist comes from an alternate timeline where the Demon Slayer Corps was wiped out. He seems calm on the surface but is extreme underneath. He has ambitions of becoming king and uses ruthless methods, but deep down he's a gentle kid who's terrified of the people around him dying. 3. "Nutritional supplements" refers to the protagonist's bodily fluids, which can heal people when consumed. The side effect is addiction. This is his Blood Demon Art. 4. The protagonist is dangerously charming, with maxed-out leader charisma. Click to see his enemies instantly surrender, transforming from rebellious, edgy kids into leader fanatics, leader worshippers, and leader stans, until everyone gets carried away with their own fantasies! 5. A story about conquest, pure wish fulfillment, my take on out-of-character behavior, and a mountain of original settings. Conquering Japan is the main plot, while taming enemies, expanding the family, getting up to ridiculous mischief, and healing through bonds are side plots. 6. All the diamonds belong to the protagonist!! 7. I'll announce the pairing once it's decided. For now, let's start with one-sided crushes~ July 12, 2020 Theme: The path of salvation and healing