Maybe it's autobiographical and the manga artist was so depressed over her humiliation as a table tennis captain she couldn't lift her pen for seven years. If that's the case, we should be respectful of her pain.
JK the last volume (3) has chapters 12-17, Special Section 2, and an Epilogue. So there are 5 or 6 chapters per volume. BTW the title of the Epilogue would be a spoiler, and it's a good spoiler, not a bad one.