The Galaxy Railways - Eternal Divergence (Vol.1-24.End)

In the beginning of the story, the main character, Manabu Yuki, has always had dreams of joining the SDF, following in the footsteps of his father and brother, who died while serving in the SDF. Unfortunately, his mother is fed up with losing her family to the great space beyond and does what she can to deter him from following his dream. Despite this, Manabu is determined to join, and boards the train to Destiny Station, the story leads on from there.