Every self-respecting princess needs a good maid to tend to her needs — even when the princess in question is as determined to do things her own way as Merurulince Rede Arls is.
In such situations, it pays for the maid in question to have a longstanding relationship with the princess in question, as that means the princess might actually listen to the maid at those times when she finds herself frustrated enough to accidentally call a parent a “poopyhead” to their face.
Keina knows how to handle Meruru, in other words. And witnessing their relationship with one another is one of the most heartwarming parts of Atelier Meruru: The Apprentice of Arland.