Description
Nagi, a divine serpent beast entity inhabiting an otherworldly realm devoid of women, manifests in a humanoid form while retaining serpentine physical traits. He summons the deceased human male Kotone Aizuhara to this world and immediately claims him as his destined Miko—a shrine priestess or bride. This bond is vital for Nagi's ascension to a higher dragon form, demanding physical intimacy between them.

Nagi initially presents the demand for ritual intercourse as an unavoidable destiny, projecting confidence and authority. He expects Kotone's compliance based on his designated role. Yet his demeanor reveals more than obligation; he exhibits possessiveness and patience toward Kotone, who actively resists the intended "bottom" role despite feeling physical attraction. Nagi blends persistence with unexpected gentleness, navigating Kotone's attempts to avoid emotional entanglement through his knowledge of BL tropes.

Their dynamic evolves beyond the initial ritual requirement. Nagi develops genuine affection and a desire for deeper connection, moving past the purely transactional nature of their union. This progression unfolds alongside Kotone's struggle to reconcile his identity as a male BL fan with his real-world experience as Nagi's intended partner.

Throughout the ongoing manga serialization and multiple original net animation (ONA) seasons, Nagi's character explores the tension between his divine purpose and the emerging emotional complexity of his bond with Kotone. His journey tracks a shift from viewing Kotone as a necessary means to achieve his draconic form toward recognizing him as a significant, cherished partner. His existence as a sacred beast awaiting a specific human within a world structured differently from the human realm underpins his character and motivations.

Later manga volumes and ONA seasons depict further character interactions and developments involving Nagi through additional couples and storylines, reinforcing his central role within the narrative's evolving relationships.