Description
Nagi is a divine serpent beast residing in an alternate world devoid of women. He appears in human form with serpentine traits. After summoning Kotone Aizuhara to this world, Nagi declares him his destined bride ("Miko"). Their sexual union is necessary for Nagi to ascend from a divine beast to a higher dragon form.

No concrete details exist regarding Nagi's origins or life prior to summoning Kotone. His motivations center entirely on achieving his transformation through Kotone, though he does not force compliance. Nagi engages in persistent efforts to fulfill the ritualistic requirement with Kotone, who actively resists developing emotional attachment using knowledge from boys-love narratives.

The relationship dynamic features Nagi as the dominant partner, consistent with Kotone's recognition of his role as the "bottom." Nagi interacts with other characters in the world, including Wu and Kagetora.

Across all animated adaptations (ONA seasons 1-5) and manga continuity, Nagi's core character remains singularly focused on his objective to evolve through union with Kotone.