Ryohei Tachibana

Ryohei Tachibana is the Sonic Diver specialist who work on Otoha's Reijin. He is a rough man and has a tendency to be a bit of a pervert, which Otoha scolds him for. He and Otoha develop a close bond, even though neither will admit it and they fight frequently.

He is voiced by Kishō Taniyama.