If you're looking for manga similar to Star Ocean: Soshite Toki no Kanata e, you might like these titles.
An unknown alien enemy attacks the Earth and the armies on Earth must try to hold off the invasion.
After taking down Dr. Wily's previous attempt at conquering the world, he's back to his old tricks and yet again, it's up to Rockman to foil his plans!
After his defeat in Rockman 3, Wily has gone into hiding. The world is peaceful until one day... Dr. Cossack attacks?! Rockman must defeat all 8 of the Robot Masters and restore peace to humanity!