Shou Yanagi, a twenty-four-year-old Head Diver at Akamatsu Industries, typically partners with Kaede Kurenai. He presents a collected public demeanor, yet significant psychological trauma traced to his younger brother's death during early Neuronoid testing triggers profound breakdowns when he encounters Keita Aono, whose appearance recalls his deceased brother.

His abilities include potent hypnotism achieved solely through eye contact. Professionally, he pilots Neuronoids, combating threats like the Algernon virus and the entity Betterman.

His relationship with Kaede Kurenai evolves into a deep personal commitment, leading to marriage upon learning of her pregnancy shortly before a final conflict. Their story concludes tragically when Kaede, succumbing to Algernon's influence, kills them both.