Become Pillars! But Upper Rank Two is Boyfriend

Chika, a mercenary from Meteor City, has transmigrated. When she opened her eyes, she was at the scene of a demon slaughter. Good news: Hooray! No more missions where she has to lick blood from her blades! Bad news: Damn it! A group of bizarrely shaped creatures is rushing towards her! A Pillar from the Demon Slayer Corps found a little kid at a mission site. Good news: She's sweet-mouthed and talented. Bad news: She's tough and incredibly troublesome. She's not tall but has a big temper. She's incapable of doing anything properly, but she loves sticking close to the Pillars and running around after them. Everyone placed bets: when would the Wind Pillar kick her out? Until the day demons besieged them. Everyone watched as the laziest one among them, with crackling thunder and lightning, cut through the enemies. The demons' blood splattered three feet away, and their ashes, after perishing, drifted in the air all night. Only then did everyone realize this wasn't a little kid at all; she was a mobile dreadnought capable of killing gods and spirits alike.

The Demon Lord, who was the Upper Rank Two, encountered a little kid. Bad news: She's with the Demon Slayer Corps and incredibly strong. Good news: She's wearing human skin, but deep down, they are the same kind. The Twelve Kizuki's after-dinner conversation: "Upper Rank Two sir has been acting strange lately. Instead of focusing on upgrading, he's been humming little tunes and thinking about how to seduce the new recruit from the Demon Slayer Corps." Muzan glanced at the images in his mind: Tsk, vulgar and garish, let him be. Until the day the demons besieged the Demon Slayer Corps, the Demon King was beaten to a pulp, yet the damn Upper Rank Two was holding the woman from his mind, smiling intoxicatingly. It was then he suddenly realized his most prized Upper Rank had betrayed him.