Please Save My Earth

Please Save My Earth (ぼくの地球を守って, Boku no Chikyū o Mamotte), sometimes abbreviated Bokutama, is a shōjo manga by Saki Hiwatari. It was published by Hakusensha from 1986 to 1994 in the magazine Hana to Yume and collected in 21 volumes (tankōbon). The series was adapted as a six-part original video animation (OVA) in 1993. Both the anime OVA and manga are licensed for distribution in North America by Viz Media.

A sequel manga, Embraced by the Moonlight, was serialized in the bimonthly Hana to Yume as well as the special edition magazine, Hana to Yume Plus. It has since been followed by I Sing with the Earth.

Plot
The story centers around high-school student Alice Sakaguchi, her seven-year-old neighbor Rin Kobayashi, and five other teenage students who have recurring collective dreams about a group of alien scientists stationed on the moon observing and collecting data about the Earth.

Initially, when Alice learns that classmates Jinpachi and Issei have been having common recurring dreams since middle school, she thinks nothing of it until she has one of these "moon dreams" herself. Because of the nature of these dreams, the way Issei always dreams as the same person, and Jinpachi as well, now that Alice has provided a third perspective, they start to believe that people who dream as the other four scientists in their "moon dreams" can each be found.

Almost like it's a game, the three make plans to seek these other people out in the hopes of making sense of these dreams. After a suggestion from Issei, and a little bit of time and luck, they are finally able to make contact with the other four people. But as the six teenagers and one child start to piece together the timeline and content of their dreams, they began to realize that their "dreams" are not simply dreams, but rather suppressed memories of their past incarnations (as those same moon scientists) that ended tragically. And now, as their "game" begins to unravel, the kids must strive to come to terms with what happened in their past lives, as they struggle to prevent their past incarnations' rivalries, jealousies, and dubious actions from taking over their new ones.