Well damn, I'd buy a Komoko plushie. Even the one on the far left that they didn't bother finishing.
Edit: Looks like you can already buy them! https://www.amazon.com/foefaik-Spider-Plushies-Cushions-Pillows/dp/B092VR2RLW
The anime is an adaptation of the LN which is ahead of the manga and covers sidestories.
You can purchase the LN on Amazon or just torrent it .
Vol. 14 is currently set to release in June 2022 but could be delayed to July or even August 2022.
They take at least 9 months to release a volume after Japan (unless it's a special situation like Haruhi or No Game No Life) so vol. 15 could come out in September 2022 but I think it's unlikely to come out before December 2022. It wouldn't even surprise me if they pushed it to Spring 2023.
I expect vol. 16 to come out the season after vol. 15 so either Spring 2023 (optimistic) or Summer 2023.
Also, I wouldn't hope you breath about the EX volume.
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So I'm a Spider, So What? The Daily Lives of the Kumoko Sisters, Vol. 1 (So I'm a Spider, So What? The Daily Lives of the Kumoko Sisters, 1) https://www.amazon.com/dp/1975336712/ref=cm_sw_r_apan_glt_fabc_74YPS1G041G5XDDQG34V
Here someone have uploaded the WN chapters. I don't know how many. They also uploaded LN and illustrations but you can just ignore those. There are probably ways to convert them to epub. https://nyaa.si/view/1096238
Yen Press puts Volume 13 (English) at 18 Jan 2022 as well.
For those who want to see it on Amazon, here it is.
I guess it got pushed back?
For the curious, the ISBN is 978-1-97-533985-2.
It's on Amazon https://www.amazon.com/gp/product/1975310381/ref=ppx_yo_dt_b_asin_image_o01_s01?ie=UTF8&psc=1 (just change the .com to your region specific url)
Link to Amazon. For future reference, we keep all the ISBNs for each novel on the Fandom Wiki so you can find them in both English and Japanese through Fandom's ISBN lookup. Just click on the corresponding novel's link and then the ISBN, and finally the place you want to purchase from. Amazon is reliable 90% of the time. Can't say much for the other links.