With a screenplay by David Ebeltoft (2016 Tribeca Film Festival’s “Here Alone”), the film is intended as a gritty re-imagining of the game’s core story of a protagonist in search of a former pen pal who disappears under curious circumstances.
The underlying Kadokawa-published game has two main gameplay sequences. First, the player interrogates people who knew the missing girl. Then the player relives the missing years and makes use of clues gathered earlier.
The game was first published in 2016 and has been made available on platforms including PlayStation 4, PlayStation Vita, Microsoft Windows, Android and iOS. It sold more than 400,000 copies in Japan and overseas, and is also available on Steam and Nintendo Switch.