X-Men Anime Series - The Return: Joining Forces

S1 E4: When a mutant high school student named Hisako Ichiki goes missing in the northern part of Japan, her parents ask Professor Xavier for his help. Sensing that the case of Hisako’s disappearance is of great importance for mutantkind, he gathers together his X-Men. However, the leader of the X-Men, Cyclops, who had lost his lover Jean during battle, refuses to return.