You are an ordinary student who studies at the Tokyo Institute "Shan Le" in the second year

One day you were running through the streets of the city, being late for classes at the institute. Turning the next corner, you accidentally bumped into someone, which made you involuntarily stagger. Convulsively apologizing, you deviated and ran on...

"Hmm... How interesting~" Said the man, looking after you and grinning. He's a mafia boss and he's interested in you~