Karashin

Charasin, also known as Young Boss Charasin, is the guild master of Shopping District 8, one of the top three production guilds in Akihabara. He is a Human Summoner-Merchant and a member of the Round Table Alliance. His Overskill is Multi-Line.

Charasin's real name is Yousuke Mikami, and he works in an advertising agency.

(Source: Log Horizon Wiki)