Board Thread:Questions and Answers/@comment-31707568-20170410003056/@comment-28251580-20170410060038

Volume 5 is not even available in Japanese yet. Kawahara Reki was just too swamped with other projects, as such Progressive didn't follow its 1 book/year pattern this time. There is currently no date announced for the JP release of Progressive 5, much less an English one.