A twenty-year-old recluse is teleported from his room and ends up before a goddess, who gives him a new chance at life. She bestows incredibly strong magical powers upon him in this new realm, but when he is reborn as the infant Prince Reinhardt, his abilities are ranked at just Level 2. Believing their child to be a total disappointment, his royal parents abandon him in a forest. There, the prince—who later calls himself Haruto—meets Flay, a Flame Fenrir who chooses to dedicate their life to serving him. Haruto's relative, Gold Zenfis, comes across the two in the woods and decides to take the boy in as his own.
Nine years go by as Haruto grows up with the Zenfis family. His command of his immensely powerful barrier magic improves each day, although Haruto would prefer not to employ it for others. He trains his magic secretly, wanting his family to think he is weak. Yet his younger sister, Charlotte, uncovers his true strength, and with Flay's aid, Haruto defends her and the rest of the Zenfis household from danger. A shady conspiracy is brewing in the kingdom; Haruto only wishes to stay indoors and watch anime, but it appears he will need to use his magic to protect the family that took him in.