Koshiki Mikio

A well-dressed fat old man with a thin mustache.

As his appearance suggests, he is a calm character. When he is nervous, he has a habit of stuttering. When he is sexually aroused, his lips dry up and he has a habit of licking his tongue to moisten them. This act is seen as vulgar and indecent.

While on a business trip abroad, a business associate invited him to a swapping party, and he introduced it to Kaori.