A magic school where every student is destined to be sent in and replace someone missing from another timeline.  How?  By becoming that character and learning how they live life!  Stuendts are given a list of options and are able to choose accordingly depending on what spell they use from the sheet.  They will then slowly, over 3 days, become that character permanently.  The user's list in specific is all animal-related characters, so they are not to remain human at all, and can be from anything