Kyuumei Senshi Nanosaver

In the beginning of the 22nd century society advanced rapidly. Now even children are able to become real doctors, a task before that took two and a half decades to achieve. And nanomachines became prevalent to fight disease. Keita is a Nanosaver, a child doctor who uses the virtual world to apply life saving techniques by entering the body and treating the patients in a virtual medical station (VMS). As more and more patients are taken in, various mysterious are uncovered about them. In the second half of the anime, a small Ethanarian alien and galactic federation is introduced.