Ryuji Azuma

Ryuuji (龍司) is an ex-swimmerundefined who coached Haru for the Individual Medley. He is also Mikhail's rival. So far, his full name hasn't been revealed yet.

History
As a swimmer, he was extremely powerful and had a promising career in the competitive scene. He was known as "Fully Built Ryuuji,"undefined however suddenly retired. After retirement, he began coaching overseas. He has returned to Japan, and owns a food blog.

Trivia

 * He doesn't like mackerel