Inoue Tatsumi is a member of the Manji Seven and the leader of the Masuda Group in the Manji Empire.
Inoue fought and defeated Abo, during the 7 on 7 battle between the men gather from Toarushi and the Manji 7. Abo, who seemingly had the upper-hand in the fight, lost due to smashing and potentially breaking his hand on a wall.
Tatsumi himself said "felt it in muscles he forgot he had". Out of respect for the Toarushi team, he had a first aid-kit sent to Sera and Abo.