On Spectrobes: Beyond The Portals, there are many portals that take place. There are the portals in space, and the portals in Krux's domain, Malik. The portals in space lead from Nanairo to Fubuki, Kagero, and Hakaba systems. The smaller portals on Malik are the only way to get to Krux, and suprisingly, Jado!
WARNING! This next part has a spoiler in it! Do not attempt reading it if you want to figure this out alone!
If you want to get to Krux, only enter the portals that move left.