In the future, alien invasion is a daily occurrence and everyone must be prepared. Elementary School #9 has assigned three students to fight off the extra-terrestrial threat.
See [AnimeNewsNetwork](https://www.animenewsnetwork.com/encyclopedia/anime.php?id=784) for the anime.
Released in 2003, the Complete version of the manga, in addition to the three original volumes, includes three short stories corresponding to each one, as well as a lot of visual material.
Some extra countermeasures, breaking time, suprise baking, aliens, and a graduation party to end it off.
Following a temporal war that ravaged Japan, the young Shoichi, his two sisters and other children must flee their homeland by boat. During this journey, they are attacked by strange suitor samurai from the future. A girl named Shizue has her face by stolen an unknown life form. The children will be rescued by the crew of a strange battleship, the Yumihari. On board, Shoichi can only note that Shizue's face have completely healed…
Many children mysteriously disappear in 2005. This is called it the "Reasal Phenomenon." A few children came back with tails on their behinds. One of them was Hana Yamaguchi. Hana calls upon children with tails and creates the "Macro Cosmic Invincible Legion of Kids."
These children can go freely back and forth from one world to another and with such special powers, they save missing children. But then, the Ali Troops invade this world. This is a fascinating science fiction drama about the wonders of the universe.
–Kodanclub.com
The girls have finally graduated 6th grade and are now in junior high… but are they really prepared for the challenges that await them? There's a new girl in town and she seems to be hosting an entirely different kind of alien… is she a new ally, or will she be the earth's latest threat?