An expansion to Lost Judgment, titled The Kaito Files (海藤正治の事件簿, Kaitō Masaharu no Jikenbo), released on March 28, 2022. It features Masaharu Kaito as its lead protagonist and does not require progression in the main game to be played. There are no side cases and minigames are limited. Additionally, there is no Premium Adventure or New Game Plus after completing the main story. Legend difficulty is available without needing a cleared game.