All the adults die in episode one. The teenagers left behind have to pilot a damaged ship through hostile space while figuring out who sabotaged them, and every decision they make corrodes the group from the inside. The show treats desperation like a psychological weapon. It's not about whether they survive the plasma field, it's about whether they'll still be human by the time they get home. The mecha here are almost secondary; what crushes you is watching trust collapse in real time, one vote at a time, one lie at a time.

In AD 2225, Kouji Aiba and Aoi Housen are astronaut trainees aboard Liebe Delta, a space station at the edge of the Geduld Sea. During a routine dive, saboteurs with unclear aims strike, and the station falls into the Geduld, a plasma field that links the planets and crushes any ship that strays too deep. Every adult aboard is killed. The young trainees must survive the long trip home as tension grows among them, while those behind the sabotage watch and prepare to attack again. The result is a psychological sci-fi drama with mecha elements.