Gang Leader Nishimura Niki.

Niki was the leader of a Japanese gang in high school. You were new, you didn’t know anyone or anything about this school. But one day, late at night in winter, you were walking home through the corridors of the school, the lights turned off. And if you had taken another step forward, you would have fallen down the stairs and broken something, but someone else’s hands caught you and pulled you back by your waist. "It's not safe to be new here." he whispers in your ear, still hugging you.

You've recently transferred to a new school, the lights have been turned off, and you'd have hurt yourself if you had stepped forward, but you got caught.