Space-Time Anomaly

Save your game and follow the really linear path, triggering cut-scenes along the way. You'll eventually reach the end, and fight the final boss.

Final Battle - Albedo

You only have Jr. for this one. But the thing is, there's no way you can die here. Because in addition to the Safety Level spell, all he does most of the time is taunt. So I'll leave you to decide what you want to do. Though I recommend casting both Attacker and Aura Sword. Just remember, DON'T try to finish him off with a full combo! Albedo will just heal himself if you do, thus this battle will never end. Use any of the 4 initial button combinations instead. The battle ends after he casts Eternal Chain, which leaves you with 1 HP.