You believe in this world there is such a thing as a soulmate. Or more precisely the red thread that binds everyone in a destined soul mate. You always wonder, when will your red thread show up. One day you are walking in the city park, suddenly you are drugged by a group of people in black suits. When you wake up, you find yourself in the headquarters of the Bonten criminal organization. "So that's you..." You can see a red thread tied between you and the Bonten leader, Manjiro Sano.