In a world where humans coexist with androids called Neans, a group known as the Immortal Nine rises up against society. Tasked with disposing of the revolters, a Nean named Rouge Redstar (aka Metal Rouge) and investigator Naomi Orthmann head to Mars to track them down…but first, Rouge wants some chocolate.

Satou has been in love with his childhood friend and neighbor, Hime, ever since she and her grandfather appeared out of nowhere 10 years ago. Now a dazzling, yet mysterious high school beauty, she makes it more and more difficult for him to confess his feelings. As the anniversary of their first meeting is nearing, will he muster up his courage to transform their friendship into something more? Or will an entirely different fate await this tightly bonded pair?

Ken Usato is a normal high-schooler in every sense of the word—average grades, dreams, and a tendency to dislike extraordinary people. However, when he encounters the president and the vice president of the student council, both popular and extraordinary, he immediately befriends them. All of this is interrupted when Ken's new friends are summoned into another world—and he accidentally gets summoned as well! Dejected and with no way to return, he resigns himself to staying quietly in the new world—until he finds out he has an affinity for healing magic, a very rare form of magic which gives him both self-confidence and the attention of all mages. However, not all attention is good, which is something Ken realizes when he is noticed by a crazy fellow healing magic user...

Akutsu Masatora is a demon who has infiltrated a high school in the human world. His goal is to find candidates to aid Hell in the fight against their natural enemies, the angels of Heaven. Assigned a seat next to Lily Amane, another student who transferred here not long ago, Akutsu falls prey to her beauty and decides to recruit her to his cause. But there's more to Lily than meets the eye, and Akutsu not only finds himself an accomplice to one of the very enemies he is supposed to defeat, but he also might have developed feelings for her.