Masuda

Masuda is the manager of Ohanabatake, a Western style tea house, often seen wearing a bandana and apron. Both Kurosaki, Riko, and a number of characters refer to him as "Master". Despite his cordial demeanor and tendency to tease Kurosaki about his relationship with Teru, the Master can be surprising frightening; Kurosaki admits that the Master is far scarier than he is. He is fully aware of Kurosaki's activities as DAISY and has watched over Kurosaki, even before either of them became acquainted with Souchirou Kurebayashi.

(Source: Wikipedia)