Nobody knows what this OVA is about while watching it. That's the entire point. The protagonist wakes into a collapsing world where the people he remembers stop existing mid-conversation, where reality fractures without explanation, and Aya is the only constant in a place designed to unmake itself. You're not solving a mystery. You're watching someone realize that knowing the truth might be worse than the comfortable unreality he's been living in. This is the kind of three-episode OVA that trusts you to sit with dread instead of answers.
A man wakes from unsettling dreams that blur into his waking life. Strange encounters accumulate, reality fractures at the edges, and he can't shake the feeling that something fundamental is wrong. His investigation leads him to Aya, a girl who seems to exist between worlds, and together they uncover a horrifying truth: the boundaries between what's real and what's constructed are far more fragile than he ever imagined. As they dig deeper, the man realizes that the people around him may have already vanished, replaced by hollow echoes of themselves. His own memories become unreliable witnesses. Every answer spawns new questions, and each revelation pulls him further from solid ground. The atmosphere grows heavier with dread as the scope of the mystery expands beyond a single person's nightmare into something vast and unknowable. This is a cerebral horror experience that treats its premise as a genuine philosophical crisis rather than a twist ending. If you want science fiction that prioritizes unease and existential dread over explanations, this compact three-episode OVA rewards your attention with a vision of reality that won't let go.