The school-phase:

Watch an uninterruptible 30-minute sequence each week for 8 weeks in which your weapon enrolls in the new Studium and includes:

-struggling to make friends/feeling different
-bullying and depression
-having a crush on a teacher's wand
-trying out for the team
-going to the dance
-getting ready for exams
-and much more!

These events will contribute to future sequences, including long therapy cutscenes.

Alternative methods of leveling up your weapon at this phase include repeatedly running The Aurum Vale by entering DF solo to find a party and only using random replacements. Each run offers a 2%-3% chance to get a unique token, of which you need 100.