A Day Gladiator

is a Japanese light novel series written by Erika Nakamura, with illustrations by Kengo Konno. The series began publication on March 10, 2011 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
Tenkai Kurodo was invited to a different world by a girl, Earl, who suddenly appeared. What was popular in that different world was the horrifying "entertainment" of abducting humans from the earth and making them fight each other. The brewer continues to be confused by being given a gun and knife unilaterally and being forced to fight someone he does not know. However, the earthling who stands at the top of the "entertainment" ... I learned that a person who is completely undefeated except for the first battle is likely to be his sister who went missing at a young age ──! ?

Draw a "fight" in a novel cut, hard action & battle story!