Hei He
English title: Undetectable Box
Japanese title: 黑盒
Type: ONA
Episodes: 1
Source: Original
Genres: Action, Suspense
Studios: 717 Animation Studio
Duration: 12 min
Rating: PG-13 - Teens 13 or older

I often fall into the fantasy upon her back. What kind of person is she? What does she like? What world view does she hold? From the occasional detailed observations of her daily life, I have inferred many unexplainable clues... After a series of fantastic imagination, I suddenly realized that the girl who has been dialoging with me in my mind is just my own wishful thinking. Therefore, on the day of the reunion, I decided to take this step...

(Source: YouTube)