22 years old and a 4th year student at the start of the series, Mayama is from Kanazawa, Ishikawa-ken and an architecture student at the art institute. He lives in the same complex as Takemoto and Morita. He occupies room 101, sharing the floor with an unknown individual and formerly Lohmeyer-senpai. He acts as a senior to Takemoto and tries to help Morita get up for early morning classes.

Mayama's character design is based upon Suga Shikao.