Futanarun's previously released work, "Futanari Bound, Countless Forced Cumshots II", is only a minor series by the artist. Also known as 'FutaRoMa' (based off the Japanese title), Futanari Public Mania is his main series.
The series is episodic, following futanari exhibitionist Kyoko Mikage as she masturbates in all sorts of places.
Exhibitionism themes are not uncommon. For example, Valssu and Milk Gohan do similar series (the protagonists even resemble each other a little.) Unlike nearly every other exhibitonism doujinshi I've seen however, Kyoko doesn't regularly get caught, watched, r*ped or r*pes someone. This is purely her masturbating in public places.
It's a deviation from the norm in exhibitionist works, and a simple premise, but the simplicity has a charm to it. The artist's passion for this nice niche is clear in the writing and art.
This latest story takes place on a nearly empty train, and she wastes little time starting. I had thought there was not a lot of ways of masturbation that can take place on a train, but there are several nice scenes. All she does is stroke her cock with her hand however, but it's that's she's in a public place while doing it and the sense of danger that's the appeal of exhibitionist work, not how she gets off.
The character is passionate about exhibitionism, yet still cautious about it. This is also true of the book, it's enthralled by what it is, yet never goes too far and gets extremely unrealistic (except the whole girl with a 14 inch penis thing.) It's exhibitionism for those that like exhibitionism.
If you like exhibitionism and would like it to be just exhibitionism every so often, rather than a lead-in to rape or humiliation or some such, check this book out.