My name is Koji Mizuno. I'm just an ordinary first-year junior high school student. Well, maybe I'm not exactly ordinary. I'm a huge history nerd. I may be the most knowledgeable person in my school, or even in my city, about the Pacific War in particular.

　And now I am visiting the Imperial Palace as part of a school trip. Right now...

　"It's your turn, group 2!"

　Oh! It's finally here! Now we'll be looking at the main event, "The Three Sacred Treasures," one by one.

　"Mizuno! It's finally here!"

　My best friend Okuno started talking to me. First, we looked at the Yatagarasu mirror one by one. The moment my face was reflected in the mirror, it started to shine. It wasn't a reflection of light. It was as if the mirror had become a light and shone on me. I closed my eyes because it was so bright.

　"W-where am I?"

　When I woke up, I was in a completely unfamiliar place. I looked around.

　"Your Majesty, you may enter!"

Suddenly, I heard a loud voice. As if it was a signal, the people around me all stood up at once. Not understanding why, I also stood up. Then, the big door in front of me opened, and a man wearing glasses and a military uniform from the Pacific War came in. As I watched, he sat down at the table in the center, which had a tablecloth embroidered with chrysanthemums.

　(Wh-what is going on?!)

As I sat down, not understanding what was going on, I noticed that my clothes were strange. They were white with various embroidery and gold strings sewn onto them. Then, the person who was being called "His Majesty"

　"Now, let's begin the meeting."

"I didn't know what the meeting was about, so I looked at my desk and there was a piece of paper there.