I found the release dates for issues 17 and 18 of the german Youjo Senki Manga. Issue 17 will release on the 5th of May and issue 18 on the 4th of August 2021. : r/YoujoSenki
If you are in the US and don't mind buying from Amazon, the Drawer Pouch is at 50% off. : r/hobonichi
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