Kezuru is a boy who loves card games. One day, the CEO of Mazica Corporation, who created the card game Mazica Party, gives him a special item called the Mazica Gear. When Kezuru got the Mazica Gear, Ballonya, a Mazin that is a fusion of a balloon and a cat, appears! While being chased by Ballonya, Kezuru transforms into a wizard! Kezuru tries to seal Ballonya into a card, however...?