Awakening her dormant abilities as a devil one day, Yuuko Yoshida aka Shadow Mistress Yuuko, is entrusted with the mission to defeat the Light clan's shrine maiden, a magical girl, by her ancestor Lilith. Yuuko meets magical girl Momo Chiyoda through her classmate Anri Sada, and challenges her to a duel, but loses quickly due to her lack of strength.
Since then, Yuuko has struggled with her role as a devil and her duel with Momo, and borrowed help from her regularly. However, by a strange coincidence, Yuuko also weakens Momo by taking away her power to cooperate in protecting the peace of Tama city.
As his classmates celebrate their middle school graduation, troubled Mirai is mired in darkness. But his battle is just beginning when he receives some salvation from above in the form of an angel. Now Mirai is pitted against 12 other chosen humans in a battle in which the winner becomes the next god of the world. Mirai has an angel in his corner, but he may need to become a devil to survive.
Makoto Misumi is just an ordinary high school student living a regular life, but all of a sudden gets summoned to the other world to become a "hero." The goddess of the other world, however, insults him for being different and strips his "hero" title, before casting him off to the wilderness at the edge of the world. As he wanders the wilderness, Makoto encounters dragons, spiders, orcs, dwarves, and all sorts of non-human tribes. Because Makoto comes from a different world, he is able to unleash unimaginable magical powers and combat skills. But just how will he handle his encounters with various species and survive in his new environment. In this fantasy, Makoto tries to transform the other world into a better place despite the humans and gods having turned their backs on him.