Various species of animals have long been cohabitating alongside humans. One day, the ones that have been abandoned by humans and live in the land of Avalanche devise a wicked plan to rise up and make humans their tamed pets. Other animals that live happily alongside humans in the land of BSC know the evil scheme so they fight to protect humankinds. The main game PET ALLIANCE is an idle and social RPG (Role-Playing Game) that follows the quest of two sides of animals, one wants to protect human and one wants to make human miserable.