Akira Oono is an ordinary working adult who manages the MMORPG Infinity Game. Fifteen years after creating the game, Oono decides to shut the servers down once and for all. However, as the clock strikes midnight, he somehow finds himself in the body of middle-aged Hakuto Kunai, Infinity Game's Demon Lord!

Soon after his mysterious transportation, he witnesses the demon Greole chasing after a little girl named Aku. Although he effortlessly dispatches the creature, Hakuto is still concerned; after all, he does not remember creating the girl or the demon! Doubting whether he truly is in the world of his creation, Hakuto decides to investigate. Bringing Aku along as his guide and companion, Hakuto sets out on a journey to find out exactly who or what summoned him to this fantasy world—all while leaving chaos and destruction in his wake.

After a long day, high schooler Shintaro Tokumitsu's plans for relaxing in his studio apartment take a turn when he discovers an angel on his balcony. The divine girl, Towa, reveals she's there to study humanity, and yet, despite his skepticism, he agrees to put her up. Prepare for the most heavenly and high jinks roommate experience of all time!

A story of the bonds between those who fight, in a world pushed to its limits. On one of the countless parallel worlds that exist throughout spacetime, humanity has fought a decades long war against the BETA, hostile extraterrestrial invaders, using humanoid fighting machines called Tactical Surface Fighters. This is a story of how humanity lives and dies while on the brink of extinction...

When the Pillars suddenly appear on Earth, threatening all life, it's only the act of the god Odin that offers humanity salvation. Providing a means of fighting back, he gives Earth the Valkyries, young female pilots with supernatural powers and spirit fighter planes. These skilled troublemakers, all young, risk their lives in a long-running war—but the final battle is fast approaching!

With Rabbi Village greatly expanding under the management of his subordinates Isami Tahara and Yuu Kirino, Hakuto Kunai can now resume his adventures while looking for items to counteract magic. He begins his search at the Prison Labyrinth in Rookie Town, where a secret laboratory deep within the dungeon gives him insight into technology that is far more advanced and dangerous than anything in the rest of the world.

Meanwhile, Rabbi Village has gained unwanted international attention from the newly formed Queendom of Xenobia, which wishes to drive a wedge between the Holy Kingdom of Light and the State of Right. But with Kunai's newly summoned aide, Akane Fujisaki, at his disposal, things may not go as the Queendom plans.