Naguru Onna (1998)

Fired by the company she works at, and desperate for a new job, accountant Yoshimura Kaoru finds herself taking a job at Paradise Gym - a boxing gym. Through a series of events she ends up becoming the trainer of an old boxer Sawada Ryohei, trying to make something of himself after quitting his well paying job. Although she hates the sport, she finds herself attached to this rude, obnoxious man and they journey forth together to find where it is they both belong.