Mahou Shoujo advice

[Atmo]

So, i'm thinkering witthin an one-shot (or two-shot) based on Mahou Shoujo Isuka, Mahou Shoujo Elena and Mahou Shoujo Ai to two players.

How strong the monsters have to be? Which tricks should them use?

They know i'm preparing a Mahou Shoujo game, but they don't know about the bad ending array i have prepared to them.