Interlude
English name: Interlude
Genres: Adventure, Horror, Mystery
Type: OVA, Episodes: 3
Aired: Mar 25, 2004 to Aug 27, 2004
Studio: Toei Animation
Source: Visual novel
Rating: R - 17+ (violence & profanity)
Synopsis:
The unnamed main character has been having strange dreams, seeing strange things, and meeting strange people. He investigates these events and finds a strange girl named Aya. With her help, he discovers that his world may not in fact be real and many of the people he thinks he knows may not exist anymore.

(Source: FUNimation)