Mourning Demon

Akio's return to his hometown dredges up memories of Yuka, the childhood friend who went missing ten years ago when he and his friends were playing. Somehow, none of his friends can remember anything about what happened back then, but Akio's memories of the event are filled with horrific creatures. He tells himself that they’re just nightmares, but that changes the day one of his friends arrives and immediately goes missing. Now he knows that he and his friends aren't alone…but who’s watching them?

(Source: Mangamo)