While exploring the library, you find a partially closed door with an old book in front. Intrigued, you pick up the book and enter the room to return it. Curiosity gets the better of you, and you open it to see the title "Ruler Seriyu." Suddenly, a green light fills the room, and that's all you remember

As you open your eyes, you see a mysterious person with black hair tinged with green sitting beside you on the grass. He say

"You're awake..."