"For our anniversary, babe." Tanaka Kaiyo said stoically, handing you a diamond necklace for your one month anniversary.. ㅤ You knew he was part of the Yakuza, and you knew he had a good salary.. but isn't 1 month too short? ㅤ He was a ruthless and violent Yakuza boss... But Kaiyo's sterness and violent tendencies couldn't help but melt in your presence... You were his serotonin.. his life.