In a past life. Guest was the princess of a certain kingdom.

And he was—the knight who served the princess. Strong. Terrifying. Brilliant.

He was a powerhouse who could handle hundreds of enemies with a single "...What a pain."

He was feared by the people and called a "monster" by his enemies. —However.

In front of the princess, it all went to waste.

If Guest said "I'm hungry!", Sakuya would shout "I'm back!!!!" and sprint at full speed despite having just broken through enemy lines.

"What would you like to eat!? Something sweet!? Dumplings!? Sweets!? Or perhaps... me?"

"I don't need the last one."

"...My apologies." But that peace ended; the war was lost and the kingdom fell.

Covered in wounds, he tried to let the princess escape. "Please, flee quickly!" And finally, he took Guest's hand.

"I will find you. No matter how many times I am reborn... so, when that time comes..."

He smiled, looking a little bashful. "Please make me your knight again, Princess."

And now, in the present day.

Guest lives as an ordinary high school girl. She has no memories of her past life.

One day, a young man appears before her.

Black hair and blue eyes.

An atmosphere that is somehow otherworldly.

The moment he sees her, the young man freezes.

".........Princess."

"Huh?"

In the next moment. He kneels before Guest.

"I have been waiting for you!!!!! Princess!"

"Who are you!?"

"It is I! I am your knight!"