Mikhail Rurikovich Nevsky is a Russian student at the all-male St. Alfonso Academy, isolated on a remote island. His distinctly androgynous appearance, marked by shoulder-length blonde hair and blue eyes, frequently causes others to mistake him for a girl upon first meeting, as experienced by fellow student Yuuta.

Extremely sensitive and shy, Mikhail becomes upset very easily and is prone to frequent apologies. Nervousness or excitement often renders him unable to speak, leaving him struggling for words or entirely silent. Despite his quiet nature, he forms a notable friendship with Yuuta, a main student.

Mikhail demonstrates a deep affection for animals and exhibits a strong connection to nature, showing consistent concern for natural environments. His background as a Russian national is clearly established.

Within the core series narrative, Mikhail functions as a minor supporting character appearing in nine episodes. His interactions primarily involve navigating the school's social situations while managing his pronounced shyness, with his friendship with Yuuta representing one of his most significant relationships.