Ulrich in need of money gets a job as a suicide hotline operator,and everything goes fine for the first couple of months.Until someone who he never wanted to speak to again is on the other line.

After nearly five years of nothing,Yumi and Ulrich suddenly meet again when Ulrich has to move for work. Yumi is currently engaged to someone else,and Ulrich who thought he was over her,realized he wasn't so tries to make Yumi think the same way.

Miss. Ishiyama's a new student to Mangrove High School where a little something waits for her.

Yumi encounters a strange time in lyoko, with XANA, of course, but she will never be the same...Couples: MAJOR YxU, slight JxA

The school is taken hostage and no one is sure of the motives. Once Yumi and nine other people are chosen for execution to make the police give them the ransom for the students, Ulrich and William must save the school and find out what is really going on.