From Prisms:

Nozomi Witches used to be the number one serial on Young Jump during its peak around 1989-

(vol. 1-5): Nozomi is a beautiful former actress who moves back to Japan from New Zealand. Upon arriving, she meets her fellow high school student neighbor Ryotaro. She then decides he needs to join the high school boxing club and helps him in his training.

The next phase of this series is around vol 6-17, with the main emphasis shifting from Nozomi to Ryotarou as he tries to qualify for the Seoul Olympics.

From vol. 18 on is the phase of this manga which Nobe called Book 2. It's about Ryotarou's pro boxing life, and the parallel life of his boxing friend/enemy/soul mate Yugo Fukuyama. At this stage the drama side of the story is almost non-existent, and there is really no suspense between Nozomi and Ryotarou.