The young head assistant of the Kuroda family. He's very close to the group and is often seen either by Ryuichiro and Kyo-san, showing a friendship with the men. He's the only one of the group that is married and is extremely loyal to her. His wife Yusue owns a nightclub, that everyone visits.
Wakamatsu, like the rest of the clan is very loyal to Kumiko and her grandfather. While he has a rough exterior he has an extremely soft spot for his wife; whom he fell in love with almost instantly after meeting her