Manabu and his brother Mamoru stow away on their fathers train.

Manabu tries to change his brother's fate when they come face to face in a Time-Knot.

Manabu is assigned to his father's old platoon, and must survive senior officer Bruce's dangerous training schedule.

The Sirius Platoon goes in search of the mythical Ghost Train.

Big One is stolen when Sirius Platoon is sent to Planet Leo Glando to investigate a crashed cargo train.

Manabu and the team must investigate what caused passenger train to explode while in deep space, but Manabu struggles to separate emotion and duty.