Izumo: Flash of a Brave Sword

Takeru Yagi has been living in the Touma household since his parents passed away. He was raised by Touma Rokunosuke, the family head. His daily life is surrounded by various people, including Yamato Takeshi, his friend and kendo club rival, the Shiratori sisters, Kotono and Asuka, and childhood friend Oosu Seri. After an earthquake hits the school, Takeru finds the campus in ruins, with all teachers and students gone. He meets up with Seri and Asuka, and they flee the scene, only to discover their hometown is also deserted. People in cloaks soon appear, claiming Takeru and others have been transported to another world.