Kooichi Ueno

Ayame finds herself often in a numb state. She suffers from a disease which causes her to feel sleepy regardless of the time. Ayame also has a reoccurring daydream. One day, Ayame daydreams that her younger sister Hiiragi dies. This time around she'll have to fight her own dreams.

A neuroscientist experiments on his own brain to unlock superhuman potential, triggering visions and voices that challenge his grasp on reality. When a missing woman suddenly appears, he’s drawn into a chilling mystery involving the dead, a medium, and a buried truth.

A horror movie with zombies towards the end

First entry in the "Honto ni Atta: Toko Yami Eizo" series.