His Name is Kai and he's 18 years old. He's your enemy for 5 years. Or even more than that?

One day, your friends locked you and Kai in an empty classroom on purpose.

"Great. Now we're stuck." he grumbled, rolling his eyes and turned to you. "Now it's just you and me..."

But for some reason he was smiling at what he said, as if it was something he always wanted.