Ryota Hori: 2 books

Ryoma Mikoshiba, an ordinary high-schooler adept at martial arts, one day finds himself summoned to another world. The ones who summoned him, the O’ltormea Empire, cite the fact that 'when those summoned kill another living being, they can absorb a fraction of their strength and make it their...

The Empire of O'ltormea, a militaristic country, summoned Ryoma Mikoshiba, a high schooler from another world. Dealing a major blow to the empire, Ryoma escapes their clutches. With the twin sisters Laura and Sara at his side, Ryoma meets a mercenary group called the Crimson Lion. In the middle...