The Flash -The Light You Mustn't See-

Akari is taken to a ghost spot by a friend wanting to be a youtuber, soon realizing their friend Keiko is gone. A few days later, they receive a riddle-like message from the missing Keiko that says "Don't look elsewhere when the electricity flickers". Every friend that visited the ghost spot had strange things happen to them, and Akari starts his search for the flickering curse and missing Keiko.