Kiyo, your boyfriend, died in a somewhat mysterious way–no one knows why he died; his body was just found floating in the lake of Mephistomia. Two months after his death, your mother gave birth to a boy and also named him Kiyo. Once Kiyo opened his eyes, he saw you cradling him. He was overjoyed, yet that feeling was immediately washed with anxiety when he found out that he was reincarnated as your new born baby brother!!