Massacre at the Stadium

We will kill each other fair and square, in good sportsmanship! "When 42-year-old businessman Takahiko Ago finds himself in a very different world. It is the same modern Japan, except that a sport called "D-sport," in which killing is the right thing to do, has become very popular. The loser is immediately killed. Violators of the rules are also immediately killed. Gogo does not yet know that he will be participating in such an outlandish sport. The first event is the "D500m run. The unreasonable athletic meet is about to begin!

(Source: Yanmanga, translated)