
Kadokawa Games · released June 16, 2016
Root Letter (stylized √Letter) is a visual novel adventure video game that is developed and published by Kadokawa Games as the first title in their Kadokawa Game Mystery brand. In the game, the player must figure out what happened to the character of Aya, a girl who mysteriously vanished after receiving a particular letter. The gameplay will be split into two distinct parts; the adventure part, where the player interrogates characters who knew Aya in order to find more information about her, and the simulation parts, where the player relives and plays through prior interactions with Aya.
Sales
90,000
all platforms · as of October 21, 2026
Latest Steam CCU
2
Steam daily peak · Oct 25, 2026
Steam all-time peak
4
Steam concurrent players · Sep 2026
| Platforms | Sales | Share |
|---|---|---|
| PlayStation | 80K | 89% |
| PC | 10K | 11% |
Source: Steam