The RWBY prequel manga from Jump author Shirow Miwa (Dogs, Kiznaiver and Joker Game) is set to be collected in Japan on May 19th. Shueisha Home Comics will be following this by a second RWBY Manga Anthology on June 19th. Evidently quite exited for the book, Shirow Miwa has started to showcase some of the bonus art prepared for stores.
Viz has a sample chapter of their English version at https://www.viz.com/rwby
— 三輪士郎/Shirow Miwa (@zi38) April 24, 2017
— 三輪士郎/Shirow Miwa (@zi38) May 8, 2017