Part 1: School Days
Initially strangers to each other, some enemies, some rivals, seven students form a crew in Part 1 and then they travel in spacetime in Part 2.
Part 2: Spacetime
The seven crewmmates witness the bustling overworld through planets and time periods, finding new crewmmates and confronting repressed demons from the academy. But, also having slice of life moments as they chill out in their cozy spaceship, Part 2 emphasizes the importance of their strong friendship.
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Part 3: Endgame
All good things eventually come to an end.