Digimon Story Lost Evolution

• Title — Digimon Story: Lost Evolution • Developer — BEC • Publisher — Bandai Namco Games • Series — Digimon • Released — July 1, 2010 • Modes — Single-player • Genre — Role-playing, simulation • Platforms — Nintendo DS

Players assume the role of either Shu or Kizuna, male and female Japanese fifth-graders respectively, who have just moved to a new district. After witnessing a luminous object falling into the mountains during a fireworks ceremony, they are transported to the Digital World, where they meet their Digimon partners. They are joined by classmates Hiroyuki, a curious troublemaker, and Asuka, a caring, older-sister type, along with Hiroyuki's second-grade younger sister Yui and her friend, a first-grader named Takuto. Together, they must aid their Digimon companions while thwarting a group of villains named Uno, Dos, and Tres.

In November 2009, Bandai Namco Games launched a teaser website with a countdown to the reveal of a new title referred to only as "RPG_LOST" and "The RPG that will return". On November 20, the timer reached zero and officially revealed Digimon Story: Lost Evolution, along with a release date set for the following year. The game received a final release date the following April, along with an official website that revealed additional content as visitors completed minigames.

A fan translation by Operation Decoded, who had fan translated previous Nintendo DS Digimon games, was released on January 1, 2023.