影山 聡史

Losing his mother when he was 7, Satofumi was taken in by the Kasuga household to look after the brothers and is like a secretary to Takafumi. It's his job to take care of everything around the Kasuga household, from financial allocations all the way to laundry. It's not an understatement to say that without Satofumi, the Kasuga family would be all over the place and hardly anything would ever get done. Though he listens to the demands and requests of the Kasugas without objection, he isn't afraid of offering candid advice when in the situation calls for it.

Since he studied overseas in the U.S., he is proficient in English, and incidentally, French. With extensive knowledge in the martial arts, he also functions as the brothers' bodyguards... However, as tough as he looks and comes across, he does have one crucial weakness- Satofumi is a hemophobia, and can potentially faint at the sight of blood. Always seen with his black suit and sunglasses, Satofumi is silent, serious and very diligent in his work.

He is actually Takafumi's first son; his mother being a lady that Takafumi wasn't permitted to marry. As a result, he is the oldest brother.