When does volume nine come out!

Have you asked SuBlime, the English publisher?
I've read it's due to slow and irregular releases from sensei. So it's a problem that comes from the Japanese releases...
You can check their site (SuBlime's) for more info(?). Look for Love Pistols.
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the japanese 9th vol isn't out yet so the english one will be far i think

The manga's licensed so i don't think there will be an update