Source:
http://ningyokan.nisfan.net/game/lapu/ragna02.html – [nisfan.net] 
 
The Overlord Prier episode is different from the main story. It has 4 endings, 1 bad, 2 average, and 1 good ending). The ending at episode 4 is dependent on whether you have received norma/good endings on previous episodes.
 
 

Ending conditions in Overlord Prrier Route

Here are the ending conditions of each episode:
 
 
To trigger a satisfying ending in episode 1, talk with the child at the orphanage. Search for the event point (that glows in red) on stage 2.
 
After a satisfying ending to episode 1, search for episode 2 at the event point on the fourth level of the dungeon.
 
After a satisfying episode 2, search for episode 3 at the fourth stage of the dungeon.
 
For episode 4, search for the event point on fight 1 after a good ending to episode 3(Inside the church vs. four demons). Do not fight against your enemies before the event point is activated.
 
If you ignore the event points, you will get a regular ending. If you ignore the event point, it will not be repeated in subsequent episodes.
 
 
Here are the conditions that will determine the ending of each episode.
 
 
Bad end – Episode 4: Do not trigger the event point to have your party destroyed at the second battle, (Inside the church vs. Father Salade).
 
Normal end 1: Get normal ending at episode 1,2, and 3. Clear the game.
 
Normal end 2: Get a great ending at episode 1, 2, or 3. You can ignore the event point at episode 4, and clear the game.
 
Good end – Check episode 4, and clear the game.

 
 

 
 
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