Warning: This story contains overpowered Teacher-students, unreasonable training methods, shameless System rewards, questionable teacher logic, and power-ups that should probably be illegal.
Enter at your own risk.
---Synopsis---
A System. Ten Disciples. One Very Unqualified Teacher.
Sunny transmigrates into the world of One Piece with the Possession Teacher System.
His mission?
Take ten disciples, teach them, make them powerful enough to shock the world, and earn his freedom.
His first disciple is Nico Robin.
Then come Hancock, Nami, Shirahoshi, and more.
The System gives them absurd abilities.
Sunny gives them absurd training.
And somehow, his disciples become even more absurd.
He thought he was raising students.
The world thinks he's raising disasters.
Maybe both are correct.
Copyright disclaimer: I do NOT own anime nor any character or works featured in the fan-fiction. No copyright infringement intended.