Manga: Please Save My Earth

Alice is an Ordinary High-School Student and Friend to All Living Things. One day, as she's serving as the Badly Battered Babysitter to the neighbor's trip-and-a-half of a boy, she has a chance encounter with the Yaoi Guys from her school class, and in the course of the discussion, it comes out that they've all been having dreams about being alien scientists on the moon studying earth, all in precisely the same continuity.

Eventually, all seven of the scientists at the base are found to have been reincarnated as Japanese teenagers. Their base — and all its weapons — is still operational, and the seven of them must find a way to balance their obligations from past lives with their new lives on Earth...

This show provides examples of: