You would think a boxing manga would be very less word heavy . If you thought that you are wrong. This is very word heavy, but if you like sports/boxing manga you will definitely like it. The plot progresses kind of slowly and can be very repetitive but the journey is worth it.
I really liked the book. It gave short expalanations 3-4 example sentences and after 3 or 4 grammar point practice sections. It gives about 113 grammar points without including bonus grammar points it gives. I solely relied on this for jlpt n3. This book might be great for people who just want to know the grammar fast and get into immersion.
Binge Reading material
This manga is easy enough to a level where you could easily binge read all the 10 volumes and it is also interesting. It is kind of graphic but that is expected from a manga called ハピネス。