Kyōtarō Azuma is a high school student who becomes a central figure in the world of espers. He is the upperclassman of Rinka Urushiba, the main protagonist, and attends the same school. His background is deeply tied to the origin of the glowing fish that grant supernatural powers, as his parents were involved in the research project that created them. This connection shapes much of his involvement in the events that unfold. Kyōtarō has a strong sense of justice and aspires to be a hero. He declares himself the emissary of justice for espers and operates under the secret identity of Crow Head, wearing a mask shaped like a crow's skull. His personality is characterized by a proactive and idealistic nature, driven by a desire to protect others and use his abilities for good. His motivations stem from a personal conviction to stand against those who misuse their powers for selfish or destructive purposes. In the story, Kyōtarō serves as a deuteragonist and a key ally to Rinka. He is the one who first appears alongside her when she encounters the glowing fish, and together they work to confront other espers who threaten public safety. His role expands as he becomes involved in larger conflicts, including an organization with ambitions to reshape society. Kyōtarō shares a close relationship with Rinka, acting as both a partner and a mentor figure early on. He also has a complicated family history that includes an adoptive sister who disappeared two years prior under mysterious circumstances and later becomes an antagonist. His parents' work on the glowing fish research adds a personal stake to the central mystery. Throughout the series, Kyōtarō undergoes development as he faces the consequences of his ideals and the challenges of his past. He is stranded on a deserted island at one point and is aided by a pelican that gained telepathy from the glowing fish, which helps him return to Tokyo. This experience demonstrates his resourcefulness and determination. His primary ability is teleportation, which allows him to instantly move from one location to another. When using this power, he often disappears in a puff of smoke-like effect. He employs this skill in combat and for mobility, complementing his role as a vigilante hero under the Crow Head alias. His abilities, combined with his sense of justice, make him a formidable and committed figure in the struggle between espers.