My review represents the entirety of this series, rather than just this specific volume.
The best way I can sum up Initial D is that it’s first part — the Gunma arc, as I call it — balances fun races, full of twists and racing trivia, with the coming-of-age story of a high schooler trying to find his place in the world. Some of the best moments are in volumes 16 and 17, which concludes the first part of the series in the winter. Focusing on Takumi’s relationship with Natsuki and including an unexpected race gives the series so much life. Those two volumes had me reflect on my high school days and what it meant to move forward, despite the heartbreak and uncertainty of doing so.
The second half, Project D, ended up disappointing me. The races are fun, sure, but the excitement slowly escaped because it lacked any major themes (that is, not until the 39th volume, which later develops in the 41st, 42nd, and the final chapter of the series). The theme of dreams comes in, which births a fantastic, high-tension battle between Ryōsuke and Rin Hōjō. It makes Ryōsuke’s character the most developed, complex, and interesting. Other than the lack of major themes, most of the races fall into a predictable rhythm that rarely breaks. The side arcs are generally not as good, with exception to Fake Project D and the moments between Takumi and Mika. The information about street racing techniques mostly disappears, as most battles come down to tires. The details about types of drifts and the advantages of some cars begin to fade away. The chapters of this arc were essentially cut in half (probably related to the publisher), which makes the pacing feel off at times, while making a 300-340 chapter series into a 719 chapter series. Overall, it has its moments, but it rarely captures the magic of the Gunma arc.
Lastly, I should mention the art: I really like it! The faces have a simpler design, but the author still manages to depict lots of expressions. I also always liked the change in character’s clothing, giving each one a sense of fashion — a fun detail. The cars are drawn exceptionally well, which of course is the main appeal of the series. The depictions of motion and sound are mainstays of the series; I especially love the use of onomatopoeia since it’s everywhere and gives an audial sense that I don’t usually see in other visual/written media (just make sure you can read katakana!). However, towards the end the techniques start to wear out and races feel too similar. Very rarely were there new angles or panels that shook up the flow of a race. I think there could’ve been more shots from really low or high angles, or a faraway shot to give a sense of perspective on the course or the speed. Furthermore, I noticed that the author very rarely shows the actual speed of the cars (via speedometer or audience calculation). Characters always say they’re going fast, but you never really see the speed. I suppose the author found certain limitations and didn’t want break continuity with a noticeably inconsistent course or an unrealistic speed, but I still think he could’ve done it.
TL;DR - I really enjoyed Initial D and recommend it, but you don’t need to read the Project D story.