This review is spoiler-free even though it contains spoilers from the original Steins;Gate anime. You should not read this spin-off unless you have completed the original Anime or VN anyway. The one very sad thing about Steins;Gate is that no matter how Okabe manages to change worldlines to reach a happy ending, the events and feelings of the people in other worldlines were very real at one point in time. That's why I've always been curious about the stories of other worldlines while watching the anime, especially the one of Suzuha's life after she time traveled to 1975. The fact that they decided to show this storythrough Mr. Braun's perspective is a very interesting choice as it manages to give a fresh look on this while answering the fans' curiosity. All in all, this spin off does a great job in that regard : the pacing is good, the elements of the story give depth to many aspects of the original storyline and the slightly altered ending feels more satisfactory for Mr. Braun's point of view. We'll deplore losing some depth compared to the anime though. If you liked the reading between lines and the scrutinizing of every word to understand the original story, you won't really find it here. While the plot stays very solid, the storytelling is pretty simple and straightforward but manages to convey emotions very well.

While all of this is pretty good, what really sets Brownian's Motion apart from the rest, and I didn't expect that from a Steins;Gate story, is the maturity of its characters interactions. While keeping a lot of comedy, the relations between the protagonists are more serious, which in relief to the emotions of the events creates an absolute masterpiece of balance.

At the end of the day, this spin-off brings fresh air to the Steins;Gate series and makes for a very solid read especially if you didn't enjoy the foolishy vibe of the anime.