Hibari Kiriko, the only sister of the Vongola Family's 10th Cloud Guardian- Hibari Kyoya- is the Cloud Unit's second-in-command. Sano Manjiro, the President of the biggest and strongest gang in Tokyo- Tokyo Manji Gang, known as the "Invincible Mikey" and an icon in the delinquent world. In an unexpected proposal. The mafia and gang will collide their worlds. What will be the outcome?