Root Letter is a captivating visual novel adventure game designed for Windows, offering players an immersive storytelling experience. As the first title in the Kadokawa Game Mystery brand, it invites players to unravel the mystery of Aya, a girl who disappeared after receiving a peculiar letter. The game features a blend of adventure and simulation gameplay, ensuring an engaging experience as players explore Aya's past through her interactions with various characters.

In Root Letter, players take on the role of a character seeking to uncover the truth behind Aya's disappearance. The gameplay is divided into two main sections: the adventure segment, where players can interrogate individuals connected to Aya, and the simulation section, which allows players to relive moments from Aya's life. This dual approach creates a rich narrative landscape, encouraging players to piece together clues and engage deeply with the storyline.