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 prewar Japan under the military regime, a bloody battle between the extremely oppressive Special Higher Police and villagers begins!

Houtaro and friends are suddenly attacked by Geryon. As they struggle against enemies that appear one after another from a space-time gate, they discover that enemies have been sent from…