![large.jpg](https://media.kitsu.app/anime/poster_images/565/large.jpg)
Mea, the three sister's maid, is actually a life-like android. She later rejoins the group, along with Mai, when the mansion returns 5 years later to the same spot. Later it's revealed Mea is a guide for the girls set to help them along their journey. Further on it's shown Mea is working with Shizuku along with Keith. (Source: Wikipedia)