Phantasy Star Online 2 The Animation

Synopsis

"Please handle the festival until I bring her back!" The Darkers were after not Tachibana Itsuki but Izumi Rina. By the time Itsuki and Aika realized this, it was already too late. The Dark Falz takes control of Rina and turns its overwhelming power against Itsuki and Aika. Rina doesn't respond in the slightest to Itsuki's pained cries. Itsuki retreats for the moment to return to Seiga Academy. While asking himself what he can do, he heads to the student council room. The student council members are agitated by their president's absence, and they ask Itsuki where she is. Rina's desire is for the school festival to succeed. He doesn't want to disappoint her when she returns. With those thoughts in his heart, Itsuki begs the student council members for help, promising that he will bring Rina back...

(Source: Crunchyroll)