Nikolai had always wanted to kill Fyodor to gain his freedom.

Since Fyodor's death, Nikolai's life has lost meaning. Is this really what he wanted? He was supposed to feel liberated. Why wasn't this like that? He used to walk alone on the lonely street of a park in Yokohama when he saw someone, a person, that person reminded him of Fyodor it had to be Fyodor.

— "¡D-dos-kun! ¡wait!"