I really don't know how to feel about this development.
The "Big Bad" is actually the director who made too few appearances.
The reveal that Jimi actually is "forced" to be a teacher makes sense considering his overall attitude, and it's a twist that I like. Given the amount of evidence (basically Jimi just being an Jimi), you can tell he's quite detached. The director thing is a bit... well they hinted at it at the same time of Jimi's reveal, so it's not completely out of the blue. The "Shitbaki" being involved too had too little build up though and felt outta left field. In the end, all the shit she does, she does with a fucking smile, and has no "evidence" of being tied down.