WARNING! Possible spoilers.
*He is a corrupt lawyer. Both in the original manga and in anime version, he tried to embezzle the inheritance of Chitose’s father (which is said to be at least tens of billions of yen), and tried to steal Gyopi-chan (a super-expensive goldfish). He was originally working for Chitose’s family (her father was a billionaire), taking care of their property. Perhaps Tanakayama was their personal lawyer. But — using the expression from manga tankōbon — he “betrayed” them (as explained above). It’s safe to assume that he was fired by them (by Chitose, or by her mother in Switzerland). According to the official canon (manga tankōbon), he then becomes a henchman of Yurika (Chitose’s rival), now freeloading in Tokaino Gakuen (Yurika’s school). Technically he is still a lawyer, but one can easily see that he is not working properly.
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