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Short, young butler-in-training. One of the few guys studying at the academy.
There is not really much to mention about this guy, he is never really involved in any of the ecchi events, nor does he do much other than stand around as eye candy for the young women around him.
However, he does have a small role in the episode where Daichi gets a love letter from a certain young lady. Out of the three butlers that attempt to give Daichi advice, Mitsuru is, predictably by simply looking at him, the one that gives the simplest and most innocent of the advice. Whereas Shingo rambles on about perverted nonsense, and Akiharu goes for broke by advising Daichi to think on the fly, Mitsuru simply says that they should start out as friends. A rather childish, if sensible, approach to romance.