Crossovers That Should Not Be 27 - three sets of three rules of three... stinkers

[classicdrogn]

... I would actually give Azumanga/GTO a fair shake. Osaka coming back to her old high school a few years later as a rookie teacher and interacting with her former teachers as a peer instead of a student has, at the least, a lot of potential.

(Possib;y with Chiyo around as a gyaru eternal house-guest after hitting an age to get into boys, though she's only taking a gap year before starting graduate school after some insanely rigorous double major)