Sorry o post, but how do I find the hidden Familiar in the school?
In the game's folder there is a link to the walkthrough. If you CTRL+F "familiar", you should be able to find the quest and the step by step guide. First you must speak to the students in the dormitory, to learn how the familiar looks like, or you won't be able to notice it (it's a small turtle). If you need more, just consult the walkthrough. :)