Six months after the protagonist entered the training school, an exam is held once every six months to join the research team.

The trainee team, which the protagonist forms as the leader during the exam, is tasked with investigating a planet that Hirayama Takashi's team once visited.

On the way there, they collide with space debris and make an emergency landing on a nearby unknown planet.

One of their teammates goes missing. Their spaceship is destroyed. Unable to contact the base, the protagonists must escape the planet on their own, and so they begin exploring the planet