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...
All for Nothing: First off, we discover that Rin actually was trying to destroy the moonbase all along, not use its power to take over the Earth. What's more, we discover that he wants to destroy it because he remembers that Shion built some device on the moonbase and left it running. However, Rin can't remember what the device does, because Shion had already gone insane by the time he built it. Rin suspects it is some sort of doomsday device, and he wants to destroy the base to get rid of it. However in the end it turns out that the device was essentially a tape-recorder, playing an eternal loop of Mokuren's song; causing all the plants in the base to grow erratically and essentially destroy everything in the base. Ooops. Better apologize to Daisuke's brother for trying to drown him.
Babies Ever After: The manga ends with Tamura and Ayako with a toddler boy and a baby girl, and with Rin's mother pregnant. In the sequel the main characters are Ren (son of Rin and Alice) and Kachiko (Mikuro's daughter), plus Sakura is finally pregnant.
Brilliant but Lazy: Apparently both Shion and Rin. Shion has top grades without even trying, and while Rin is confirmed to be a Child Prodigy, he's a normal kid (until Shion's memories awake).
Broken Ace: Shion: he's good-looking, a genius, and has a incredibly powerful sources. He's also so broken that he believes himself unable to love or care for anyone, and that he will never be able to be part of a family or happy because of his issues.
Broken Pedestal: Alice seems to idealize Shion, then it becomes clear that he's up to no good and the others tell her what a jerk he was.
The Chains of Commanding: Hiiragi, to the point that even his reincarnation (Daisuke) feels bad for the choices made on the Moon.
Cool People Rebel Against Authority: Shion, but the constant conflict with authority doesn't end well: first he was selected (exiled) to go to study Earth by the government; then the other scientists isolate him. Mokuren has shades too.
Deceased Parents Are the Best: Mokuren's parents, especially her father, qualify. La Zlo too, as Shion (and Rin) is strongly influenced by his words, despite La Zlo only being Shion's adoptive father and they lived together for a mere 78 days.
Disproportionate Retribution: Shukaido vaccinates only Shion against a lethal virus, without telling him, forcing him to see his beloved die and to remain stranded alone on the Moon (their home planet was destroyed during a war) for nine years. The reason? Mokuren loves him even if Shion is an ass and a bundle of emotional issues with legs who even comes to rape her.
Double Consciousness: All the reincarnated characters have problems putting a line between the present and the past: Issei falls in love with Jinpachi due to Enju's feelings for Gyokuran; Alice is so scared by the possibility that she ends up blocking the memories; and Rin, being only eight, is slowly being absorbed by Shion's personality.
Easily Forgiven: Rin lied to everyone, mind raped one of the heroes to the point he tried to kill himself, send another one to the hospital, blackmailed people to obtain what he needed, kidnapped the girl and tried to Take Over the World. Don't worry, Rin, it's all okay now. Slightly averted in the sequel where Shion is considered unpredictable and somewhat dangerous, but not evil.
Energy Ball: Every fight with ESP seems to involve this.
Fate Worse Than Death: Shion: stuck on the Moon, completely alone, surrounded by the corpses of his coworkers and the woman he loves, for nine years. No wonder he ends up insane. Oh, and it was someone he trusted that inflicted this on him.
Fighting from the Inside: Rin find himself with the desires, personality, and memories of a fully grown man in his head, and considering that his and Shion's goals are opposites, here we go.
From Bad to Worse: For the the scientists on the Moon. And for the kids on Earth too.
Futureshadowing: It's very, very confusing: Mokuren faints on the Moon and sees Rin falling from the balcony. And she somehow manages to save him.
Gender Bender: After Reincarnation. Enju, a woman, wished to be reborn a male, so that she could stay close to Gyokuran in the next life without that messy romance stuff getting in the way. It worked... but not in the way she expected: she became Issei... and Gyokuran became Jinpachi, another male.
Green Aesop: The title and overall plot refers to this. The Moral goes something like this - "Take care of your planet while you have it, cause you Earth-people still have a chance at redemption. Unlike us, Space Scientists whose home space-faring civilization self-destructed in war."
Green Thumb: Mokuren can make plants grow or wither faster than normal with her singing. Not as lame as it sounds. See Lethal Harmless Superpower entry below.
Happily Adopted: Shion was healing, after being adopted by La Zlo. Unfortunately La Zlo died after 78 days in a car accident while Shion was at school. Mikuro too is adopted.
Heroic BSOD: Alice has one when she remembers that Shion didn't love Mokuren (not true, but Mokuren believed that). All the scientists have one when their whole solar system gets destroyed in the war.
Parental Abandonment: Especially for the aliens: all the Kiches are given up by their parents to the Government (Mokuren's father also died); Shion is a war orphan and his adoptive father died in an accident. Rin's mother freaks out about Rin's personality changes and tells him he's not her son, leading him to run away. Mikuro's biological mother refused him because of his powers when he was five years old.
Rape as Drama: Subverted? The concept is used for Big Drama in this series. However what actually happened between Shion and Mokuren is moot as everyone is an Unreliable Narrator due to unclear memories heavily influenced by emotions. See YMMV section for details.
Rapunzel Hair: Mokuren; Alice; Ayako and Shion after years on the Moon.
Unreliable Narrator: Everyone, due to unclear memories heavily influenced by emotions. They also often state things as fact when they don't actually know the full story, while believing their own statement. (Y'know, like Real People do) Biggest Example: "Shion raped Mokuren" turns out to be way more complicated than those 3 words, Also Mega Spoiler: "Shion wants to destroy the Earth" turns out to be completely off the mark. Especially interesting because Rin also believes this. You would think that would be reliable since he shares Shion's memories, but no.