B-Project became leaders in the monthly “voice actor sales power ranking” category of Anime Power Ranking in July, ranking higher than big names in the music business, Mamoru Miyano, Aqours and Mizuki Nana.
The Anime Power Rankings is a monthly survey (with several categories ranging from popular anime to popular seiyuu and music release) that is the best indicator to determine if a project/seiyuu/group/music is popular in Japan. The Anime Power Rankings are highly regarded in Japan, hence Oricon even made an article about it.
B-Project have expanded from music to anime to stage over the course of two years. Takanori Nishikawa (T.M.Revolution) is the producer and Chiyomaru Shikura is the lyricist/composer as well as MAGES. representant (the company behind the anime adaptation).
The survey ran from 17/7/2017 to 14/08/2017. July’s results were only made public recently.
SOURCE: Oricon news