Kuran Yotsurugi is from a yakuza family and he is an adopted son. He has 13 siblings, all of them adopted, but he has a younger brother who was adopted with him. Kuran abandoned his feelings because of his friend who died, and this is how he He change and lost himself. Kuran does not feel or show emotions on his face. His face is emotionless, but deep down he is kind and gentle.