The Cursed Boy

This story is about a teenage boy. His name is Layton, and he is considered a loser in the school. When he was 8, he started to hallucinate and dreamed a lot of strange phenomenous. Many also call him "The boy who faced the death". When he turned 15, all he dreamed in the past started to happen. He and some other students had to survive a real massacre from a murderer or more specifically a demon. He wanted their spirits, so he can contain his energy. But the question is; Did all of the students survive or all of them were dramatically killed;