Synchronization of thought between the pilots is necessary to control a MA-Vess... Heito and Emiru, showing high synchronicity, are involuntarily paired up for field training near the Lightless Realm. However, as if it was reacting to the terror Emiru hides deep within her heart, the environment becomes surrounded by an abnormal atmosphere. Over time, Heito's insanity corners Emiru, forcing a situation where there was no turning back from. (thetvdb.com)