He views Nishiki with utter disdain, showing a complete lack of respect towards him, thinking that he'd much rather serve under Kiryu rather than Nishiki.
He wears a navy pinstriped suit over magenta shirt. He has a short curly hair and a stubble and wears a pair of aviator sunglasses.
Following the formation of Nishikiyama Family, Matsushige is transferred over to the family from the Kazama Family under Osamu Kashiwagi's order to help the family get on its feet, as Matsushige is known to be a top earner in the Kazama Family. However, Matsushige is less than pleased working with Akira Nishikiyama.
One day, Nishikiyama is desperate to raise funds to pay for her sister's heart surgery. A doctor is willing to help as long as Nishikiyama paid him 30 million yen, causing Nishikiyama to beg for Matsushige's assistance to get the said 30 million yen. Matsushige managed to get the money, however, much to Nishikiyama's anger, he earned it by extorting the doctor who was supposed to save his sister, causing Nishikiyama to stab Matsushige who indirectly killed his sister.