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Not OP, but gonna use his format.
-Green Green.
-12 episodes, 2 OVAs.
-Romantic comedy harem ecchi.
-A pair of lovers die without getting to spend their lifes together, and thus promise each other to be reborn to find each other again. The girl is reborn a thousand years later than the boy, yet manages to convince the godess of time to give her a chance by going back to the past. But this time around she has competence.
The enviroment is held at an only-boy school that as an experiment has an all-girls school to be moved with them to see if a mixed high school would work.
-Hell if I know if it's dubbed. Subbed it is.