Hibio is the teenage son of an adventurous archaeologist mother, raised in modern Tokyo separate from her research. His mother brokers his marriage to Nima, leader of the Tattoon tribe, in exchange for research access, without his knowledge or consent.

He greets the arranged marriage with consistent hostility and resistance upon Nima's unexpected arrival. Hibio exhibits a short-tempered, blunt, and occasionally aggressive personality, particularly towards women. He holds a cynical view of women in general, seeing them as trouble, a viewpoint especially directed at Nima and his class president Fujimatsu, who also pursues him. His initial reaction involves active attempts to reject or avoid Nima.

Despite his outward hostility, underlying complexities emerge, suggesting a hidden romanticism beneath his harsh exterior and potential for emotional development. The arrival of Nima and subsequent conflicts, including rivalries and confrontations with adversaries from the Tattoon tribe's mystical world, force him to adapt and respond.

His family life involves an absent mother focused on archaeology and a father who produces adult-oriented videos and harbors unrequited feelings for Hibio's mother. Hibio's relationships are central: his contentious dynamic with the magically empowered Nima, his antagonism and rivalry with Fujimatsu, and his reactions to his parents' unconventional choices.

Hibio possesses no inherent magical abilities tied to the Tattoon tribe's "pattern magic." The mystical elements primarily involve Nima and other tribal members. His role remains that of an ordinary Tokyo teenager reacting to extraordinary circumstances, not an active participant in the magical system.