The era when Samurai and Ninja existed in Japan. Rikka Isurugi was born and raised in a Ninja clan secluded from society. She soon meets Miya, a girl with a…

In the year 2050, mankind is extinct. The last survivors travel back in time to stop the invader, Killgis, aided by roboticist Kenichiro Kurenai. When they arrive at the past,…