Ok, I am going crazy at this point. Does anyone remember an

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Ok, I am going crazy at this point.

Does anyone remember an anime of this description:

1.) One of the characters is a loli genius with green hair, and she has an assistant who is obsessed with her and her stripped stockings.

she is just one of four/five chicks in the anime
2.)One of the episodes she is about to destroy the world with a giant robot, and the main male protagonsist stops her. Basically, they are all supposed to do something to save the world, but she gives up and wants to destroy it.
if you remember this loli.... then you win the game