Successfully complete the indicated task to unlock the corresponding ending:

Almaz: Win stage 8-4 with Almaz alone then the following battle. 
Human World: Kill at least 99 allies and complete two alternate stages by 
stage 7-6. 
Laharl: Go to the homeroom, propose "Watch a New Ending", and complete the 
stage. 
Mao's Ambition: Complete stage 1-9 on the second or higher cycle before stage 
4-4. 
Normal: Do not qualify for any other ending. 
Raspberyl 1: Lose against Raspberyl on stage 1-5. 
Raspberyl 2: Lose against Raspberyl on stage 2-1. 
Super Hero: Defeat the final boss with Mao at level 500 or higher.