In the futuristic AD 2225, Kouji Aiba and Aoi Housen train as astronauts at Liebe Delta, perched on the edge of the Geduld Sea. Disaster strikes when mysterious saboteurs disrupt a routine dive, sending the station hurtling into the deadly plasma field that connects planets like a nerve system. As the adult crew perish, the young trainees must navigate the perilous journey home, navigating internal conflicts amid mounting distrust. Unbeknownst to them, the culprits behind the sabotage scheme await their chance to strike again.