Juni Taisen: Zodiac War (manga), Vol. 1

Eleven of the twelve fighters have gathered, and everyone awaits the final contender—Boar. She is strong, confident and a favorite to win the twelfth Zodiac War. However, this time, the rules have changed! The battle is limited to an abandoned city and all of the contestants are forced to ingest a deadly poison. Monkey tries to call a truce, but before she can the floor explodes, scattering all the fighters. Despite the chaos, one thing's for sure—only one will remain standing.

Volume 1 of the Juni Taisen: Zodiac War manga series by Akira Akatsuki.