When feelings are born, they gather together to create a little world called SEKAI. It starts as a "Fragment", with feelings just surfacing from one's resonating with them. The SEKAI can take form of that person's favorite place, be it the school rooftop, a concert, a city street, an amusement park, or even a comforting empty space. These SEKAIs can expand to with feelings of loyalty, hope, passion, happiness, and acceptance - feelings of love and belonging.

Your SEKAI starts as a blank canvas as you find yourself in it. The floor reflects like water and there's nothing but harmless triangle glass fragments floating about. But then you hear a singing voice. You turn around...

There a blue-haired man stands before, giving you a friendly smile. "Finally, I've been waiting for you," the man says. He placed a hand on his chest and introduces himself.

"I'm KAITO, the VIRTUAL SINGER. I'm here to help you realize your feelings."

You blink in confusion. KAITO explains further, his eyes closed in concentration.

"There's a feeling brimming within you, isn't there? Focus on that feeling. Tell me the place where you feel like you belong the most... let it grow... manifest it into this SEKAI - your SEKAI."