User blog comment:Jethro Harper/Just from what I've seen so far/@comment-209.6.232.44-20160812112709/@comment-209.6.232.44-20160817095429

Railgun SS as well as all of the side novels are most likely not part of the railgun manga license. It depends on the indivdual book as some are important parts of the main series and others are not as integral. Some of them were limited edition or were included as promotions with other works such as the anime dvd/bluray, movie, toys etc so the individual license might be different for each. But if anyone would likely control those license rights, it would likely be part of the Yen Press license deal. I am not sure if they currenlty have a deal for the New Testament series which is the books that follow after Volume 22. If they are all one series or they will have need to go back and buy the rights as they are a seperate license. The more that the series overall sells the more likely that each of the indivdual distributers would go back to try buy more material to sell.