Root Letter, released in 2016 for the PS Vita, is a visual novel adventure game developed by Kadokawa Games. It's the first in the 'Letter' series and blends mystery with a compelling narrative as players must unravel the truth behind a 15-year-old unsolved case. Set in Shimane Prefecture, the gameplay involves investigating clues and interrogating former friends of an old pen pal whose letters suggest a murder occurred. The game's genre encompasses both elements of adventure and visual novel storytelling, appealing to players interested in interactive narratives and detective work.