Lock, a beast tamer without a familiar, had been faithfully supporting his friends in an S Rank party. However, they ultimately chose to use him as a decoy, leaving him behind. After an unexpected encounter with the Fenrir they had been attacking, the creature decided to pledge its loyalty to Lock as his familiar. Through the use and expansion of the [Mini Monster Garden], Lock begins to collect an ever-growing array of familiars, aiming to create the strongest—and cutest—party imaginable. Join him in a fantastical adventure where humans and beasts embark on thrilling journeys together.