KEIKO? HARU’S BOYFRIEND? It makes me happy to know people are interested in them.. Kei is an assassin!! Haru and his stories are based on very cheesy tropes so ahem. He was born into a family of assassins and trained as a child to become the head of the family when he came of age, only for his parents to be killed while he was still a teenager. Keiko felt he should still bare that burden but as the other killers had become more of a family to him than his parents ever had been, he decided with their guidance to let the role of leader fall on someone else. They got vengeance in his stead. Keiko could have left and lived a normal like after that but he still felt indebted to his new family and knew nothing other than living with a purpose decided by others. Years later he meets Haru at a bar while stalking a man he intends to kill in a week’s time, and his life is changed forever.