
Kakeru was a high school boy. he had been living a dark life ever since his sister attacked him n committed suicide 7 years ago. losing the last family member he had, Kakeru managed to live on with the support of his childhood friend, Yuka. one day, they were transported into an alternate world called the Red Night. to return to the normal world, they had to survive the Red Night, fighting against Black Knights n dark spirits. on the next day, a new transfer student named Shiori joined their class. she only showed interest in Kakeru despite being welcomed by the class. after school, Kakeru n Yuka avoided the path they took while being brought into the Red Night yesterday. however, they realized they were stalked by Kukuri, a student that looked oddly similar to Kakeru's dead sister.
the anime started out completely packed with action, little explanations were provided until Misuzu came into picture. she was brought in n out of the Red Night for numerous time, knowing who the Black Knights were n finding out what they truly want by trapping Kakeru, Yuka n some others inside the Red Night. with so many members involved, it often complicate the battles, but making Kakeru's possession of the Eye of Aeon a convenient solution every time. besides that, every other explanations made sense n tied things up perfectly. the anime was somewhat different than the usual battle-themed anime, with some surprising twist n ways to reveal the mystery it purposely withheld from its viewers at the beginning of the show.

