User blog comment:B214/Don't ask about season 4/@comment-28141759-20160524084900/@comment-26402117-20160527154702

There is no info, if anyone asking here is actually literate.

This is an ecchi series. It was unlikely to get an anime in the first place, let alone get a new season every year. The honest reality is that people in Japan don't casually buy this stuff as its not mainstream. So its less likely to make money and thus more of a risk.