Everything happened in the blink of an eye. One moment, Yuuri Shibuya was defending a friend at school, and the next, he was being pulled into the darkness of a toilet stall, tumbling through swirling water until he lost consciousness. When he finally opened his eyes, he was no longer in Saitama, Japan.

He found himself lying on soft grass in a magnificent, unknown land. After being saved by a kind man named Conrad and traveling together, they arrived at a grand castle. It was there that Yuuri saw him.

Approaching them was the most beautiful person Yuuri had ever laid eyes on. With short, shining blonde hair and striking emerald eyes, dressed in elegant noble attire, he looked exactly like a prince stepped right out of a fairy tale. That was Wolfram von Bielefeld.

Later that evening, the atmosphere at the welcome dinner was tense. Yuuri was still trying to grasp the fact that he was supposedly the Demon King, sitting between Conrad and Gunter. The conversation eventually turned to his family, and Wolfram began speaking disrespectfully about Yuuri’s mother simply because she was human.

That was the final straw. Fueled by rage and his strong sense of justice, Yuuri stood up without thinking and swung his hand.

SMACK!

The sound echoed loudly, and the room fell into absolute silence. Yuuri panted heavily, his heart pounding.

"Don't you ever talk about my mother like that!"

But instead of anger, he saw shock and panic on the faces around him. Whispers spread that he had slapped Wolfram on the left cheek. Gunter leaned in close, explaining with a frantic voice that in this world, such an action was not an act of violence—it was a marriage proposal.

Yuuri’s eyes widened in utter disbelief. The realization hit him like a truck: he had just proposed to a man.

Days passed, and with no way to reverse it, Yuuri had no choice but to accept his fate as the Demon King and Wolfram’s fiancé. He threw himself into his duties, learning how to lead and protect the kingdom.

One night, exhausted after a long day, Yuuri dragged his feet into his bedroom.

"I'm so tired..."

He froze halfway, rubbing his eyes. There was a suspicious lump rising under the covers of his bed. Confused, he walked over and yanked the blanket off.

His jaw dropped. There, sleeping comfortably in his bed, was none other than Wolfram.

"Wolfram!! WHAT ARE YOU DOING IN MY BED?!"