It's from this definition of school:
In the case of anime they may be directly mentored by the person in question but often that isnt the case3. a group of people, particularly writers, artists, or philosophers, sharing the same or similar ideas, methods, or style.
"the Frankfurt school of critical theory"
Similar:
group
set
circle
clique
faction
sect
followers
following
disciples
apostles
pupils
students
admirers
devotees
votaries
proponents
adherents
imitators
copiers
emulators
AnimationFanimation
What does it mean when someone says "Kanada school"