|Name in Japanese||政|
|Voice Actor (Japanese)||Katsuki Murase, Shūichi Ikeda (young Masa Shiranui)|
|Voice Actor (English)||Christopher Sabat (English)|
Masa (政 Masa ) is a member of the Seto Group and is Gozaburo Seto's right hand man.
Masa is a tall, muscular man and he has a similar hair style like Nagasumi. He also wears a suit and tie mostly throughout the series and is always seen wearing sunglasses.
Masa does not object to the engagement and sometimes even gives advice to Nagasumi. Usually he is portrayed a silent man but due to his highly good looks he mostly captures peoples' hearts such as making Nagasumi's Mother fall for him just by looking at her and even making Nagasumi admire him.