This is a Fan-made video for the Opening of the horror anime Another using the light-hearted music from the comedy/romance anime Chuunibyou demo koi ga Shitai (or Chuu-2 for short).
Chuu-2's protagonist Takanashi Rikka is a delusional high school girl who likes to dress up as the spooky, reclusive Mei Misaki, one of the main characters of Another, utilizing the same type of eye-patch from the show. Rikka is so deep into her own surreal persona that she actually believes herself to be some sort of sorceress "cursed" with a Wicked Eye that must be covered at all times. This is not for cosplay. Rikka believes it to be real, much to the chagrin of the few friends she has, as they try to keep her out of trouble and grounded in reality.