Master

The owner of Manga Café Hokkyokusei, commonly referred to as Master (マスター), is a minor supporting character in Kamen Rider Nio. He never appears physically in the show, instead communicating through various order slips sent along various lines throughout the business. Iena Sugiyama confirms that he never seems to leave his office but still handles the financial side of the business, leaving all other matters to the café's main employee.