Aki Tesno lives in a poor village at the bottom of a valley. One day, a man from an uptown city asks Aki to rescue a kidnapped girl.

After armored trooper pilot Chirico Cuvie is given orders to transfer to Planet Odon, he and all of the other new recruits are sent into a simulated battle to test their abilities. However, this 'simulated battle' turns out to be a serious fight to eliminate those without the necessary skills. Chirico survives along with just three others, despite the fact that he fought while injured. It soon becomes apparent that this is not the first time he has survived against incredible odds, a fact that Colonel Peruzen wishes to exploit. But is Chirico truly immortal? (Source: Anime-Planet)

One day, when Remu Mikage is on a video call with his sister, Shiki, who has traveled to the futuristic Okinotori-island Mega Float City for school, she confesses that both the audio and visuals of her are completely artificial. In order to be more efficient in her studies, Shiki has used neural-linked nanomachines to upload her consciousness onto a computer and is storing her physical body in a body pool. While shocked, Remu is supportive of his sister's decision, until the disaster known as the Early Rapture happens. The Early Rapture causes everyone who has uploaded their consciousnesses to either fall into a coma or perish. Remu visits his sister's empty apartment one last time, but is shocked when Shiki arrives at the door. With no memory of her family or past, and being pursued by a violent group of researchers, Shiki and her brother are forced to flee using her newfound power of nanomachine manipulation.

Kio is just another boring, nice guy with a boring, nice life until he meets a beautiful, curvaceous cat-girl while attending a memorial service for one of his ancestors. Next thing he knows, he's lying in bed with this half-naked beauty next to him! Her name is Eris, and she has come to Earth to learn more about its inhabitants as a representative of the planet Catian. And she's decided to set up shop at Kio's home for her stay on Earth! Unbeknownst to Kio, there are quite a few organizations who will attempt to capture Eris, looking to keep her existence a secret by any means necessary. What's worse is when people around Kio turn out to secretly be a part of those organizations! Kio will have to work hard to keep Eris safe from these shady groups. Things are about to get mysterious, exciting, and most importantly sexy in Asobi ni Iku yo!