The Rising of the Shield Hero by Aneko Yusagi

"I will see to your punishment. Come at me!" Yomogi, a female samurai, attacks Naofumi and his team. The Shield Hero, Naofumi, finds himself separated from his companions–and reduced to level one! With the help of Kizuna, one of the holy heroes from the new world, he is able to reunite with his friends. Naofumi prepares to battle their enemy Kyo, but then Yomogi attacks, declaring she is acting on Kyo's behalf. In the middle of battle, Naofumi notices something strange about her powerful weapon–but what is it? Find out in volume nine of this otherworldly revenge fantasy!