Itagaki needed to train against a boxer who beat him with fouls. Who does he go to? Mashiba. He rejects at first, but then Itagaki mentions Kumi...
Itagaki: Tell your sister I said hi. She always takes good care of me and senpai.
Mashiba: ...wait. What do you mean by 'takes care of you'?
Itagaki: Be seeing you.
Mashiba: When you say take ca-
Mashiba: Get in the ring.