干支✿ロワイヤル

One day, an ordinary high school girl by the name of Ichika Kotobuki saves a dog on the verge of death on the side of the road. However, all of the sudden, the dog transforms into a human. As a consequence, Ichika gets dragged into an event that runs once in a thousand years known as "Eto Battle"! Note: Includes 4 extra chapters.