A young man from modern Japan receives an unexpected gift from a beautiful girl: an Isekai Reincarnation Ticket. He awakens as Rufus, the seven-year-old third prince of the kingdom of Eladoria, a world where nearly everyone is born with a unique skill. Rufus’s granted ability is the rare Summoning Skill, and he is given a divine mission to raise its fame. Instead of pursuing power or glory, Rufus decides to use his imagination and his new power to summon a variety of magical creatures, aiming for a carefree life surrounded by adorable, fluffy companions.

Rufus’s summons are as whimsical as they are extraordinary: a dragon that flattens mountains, a lizard that breathes fire hot enough to melt metal, a mole that cultivates legendary-grade materials, a talking treasure chest that contains sealed ancient dangers, a mischievous fairy, and a tin robot. With these bizarre yet endearing partners, Rufus sets out to explore his new world, experiment with his ability, and live life on his own terms. Along the way, his actions cause ripples far beyond his castle home, drawing in his family—including a king and first prince with unusual hobbies—as well as nobles, commoners, and other inhabitants of the kingdom. He stumbles into dungeon delving, ruins excavation, monster taming, and even cooking, all while keeping the mood light and comedic. The story follows his gradual mastery of the summoning skill, the growing bond with his magical beasts, and the slow but inevitable changes he brings to the world around him, all from the perspective of a cheerful, occasionally overconfident seven-year-old prince.