Rie Nakagawa

In a post-war alternative timeline, Japan is divided into the North, controlled by the Union, and the South, controlled by the United States. A mysterious high tower rises within the borders of the Union. Three high school students promise to cross the border with a self-built airplane and unravel the secret of the tower.

The story is set in an alternate world called Geminar, where countries have fought endless wars with replicas of humanoid Seikishi weapons that they found in ancient ruins. 15-year-old Kenshi Masaki, the half-brother of Tenchi Muyo! protagonist Tenchi Masaki, is summoned from another world to Geminar.

The Social Welfare Agency saves the lives of terminal patients using cybernetic implants. Then it teaches them to kill. After surviving the slaughter of her family, young Henrietta awakens to her new life at the Agency with a rebuilt body and no memory. Teamed with Jose, who is responsible for turning her into the perfect assassin, Henrietta’s been given a second chance—but at what cost?

At Yachimata, there is a legend of a deity named Tayutayu-sama who protected the area, but this deity and other so-called "Tayutai" have been lost in time. Mito and his friends discover a relic on the school grounds with mysterious patterns on it. Then, at the opening ceremony of the new school year, an equally mysterious girl named Mashiro appears before Mito. Mashiro is somehow tied to the relic and the legend of Tayutayu-sama.