Valkyries—legendary female warriors from the land of gods, Asgard—are sent by Odin to protect Earth against the growing threat of demons. To overcome these threats, nine valkyries under the guise of the Saotome sisters will have to level up by performing a variety of romantic acts with their official lover, Einherjar. Meanwhile, the socially anxious Takuma Akutsu learns that Odin has chosen him as the valkyries' lover. Despite his utter horror, however, he agrees to let the sisters stay in his big yet empty house to help them in their war against demons. With nine beautiful women sharing his roof, will Takuma manage to prevail over his fear of society and become someone worthy of saving the world? [Written by MAL Rewrite]

In a world covered by an endless sea of sand, there sails an island known as the Mud Whale. In its interior lies an ancient town, where the majority of its inhabitants are said to be "Marked," a double-edged trait that grants them supernatural abilities at the cost of an untimely death. Chakuro is the village archivist; young and curious, he spends his time documenting the discovery of newfound islands. But each one is like the rest—abandoned save for the remnants of those who lived there long ago. For the first time in six months, another island crosses the horizon, so Chakuro and his friends join the scouting group. During the expedition, they find vestiges of an archaic civilization. And inside one of its crumbling remains, Chakuro discovers a girl who will change his destiny and the world inside the Mud Whale as he knows it. [Written by MAL Rewrite]

Deep in the Ararat Mountains of Turkey, a secret organization known as ARCAM has found what is believed to be Noah's Ark. However, the U.S. Machine Corps., a rogue organization of the Pentagon, wants to take over the Ark as a means of global supremacy. Only a special ARCAM operative known as a Spriggan stands in their way. Japanese Spriggan Yu Ominae teams up with French Spriggan Jean-Jacques Mondo to combat members of the U.S. Machine Corps. led by Col. MacDougall—a genetically-enhanced boy with deadly psionic powers. However, they must act fast and stop MacDougall before he uses the Ark for his own agenda.