|Affiliations:||Toyo Electric Power Co.|
|Relatives:||Kurayoshi Rino (daughter)|
|Manga Debut:||Chapter 35 (shadowed)|
Chapter 39 (full debut)
Hayami Katsumasa is the CEO of Toyo Electric Power Co. and head of the Society of a Hundred, the largest faction within the Kengan Association.
Hayami Katsumasa is a distinguished looking gentleman with greying hair set in a middle-parting and a thick grey moustache. The left side of his face is horrifically disfigured and his left eye is whitened. He is always seen wearing a smart suit.
Twenty years ago, Hayami had dark hair and lacked a moustache however his facial disfigurement was still present.
Hayami is an extremely intimidating individual, able to exert charismatic pressure that rivals that of Katahara Metsudo. He is also noticeably power hungry, willing to go to great lengths and commit atrocities in order to secure dominance in the political and financial worlds that he inhabits.
Hayami appears to have a deep history with Kengan Association chairman Katahara Metsudo, and it is implied that he has rebelled against Metsudo once before, which resulted in his massive facial scarring. Since then, he has amassed power within the Kengan Association, forming the Society of a Hundred, the biggest faction in the Association.
Twenty years ago, Hayami encountered a 13 year old Meguro Masaki, after the youngster had just killed his father, and took him off the grid in exchange for taming him to be his pawn. As a result of Hayami's action, the case for "Boy M", as the police called him, went cold.
Roughly a decade ago, Hayami ordered Urita Sukizo's father to assassinate Nishihonji Akira's father, which inadvertently resulted in the death of Inaba Ryo's father in the process. This order eventually lead to Penasonic and Nishihonji Security Services leaving the Society of a Hundred.
After hearing Chairman Katahara's special rule while still on board the S.S. Kengan, Hayami sent out his mercenaries and assassins in order to obtain as many representative fighter positions as possible. With only Nikaido Ren and Meguro Masaki successful in this venture, Hayami managed to obtain six places in the Kengan Annihilation Tournament. He also solicited Ohya Ken upon arriving on Ganryu Island, and urged him to join his side.
While the tournament's first round was underway, Hayami visited Chairman Katahara personally, revealing his Guardians that he created as a mirror of Katahara's Bodyguards. With Katahara asking why Hayami wasn't at the stadium to watch Julius Reinhold's match, Hayami revealed that it would be over soon as he had put in place for Murder Music to forfeit; sure enough, Julius progressed to the next round due to forfeiture.
During the C-block portion of the first round, Kito Gunji commended him for placing his pawns, Ajiro Fisheries and Village of the Dawn against each other in order to conserve their strength. Hayami then mused on how he would soon usurp Katahara from his position.