Gargantia has had a close relationship with all sorts of doujinshi authors. Look at its end cards and the tribute illustrations its posted. And, it's not been uncomfortable with eroge artists, employing hentai talent Hanaharu Naruko for its original character design. So, it's not unexpected that Production I.G will be featuring that sort of work in special items prepared for the Summer Comiket doujinshi mega event.
Producer Nao Hirasawa has previewed some of the goodies, headlined by a water proof "bath poster" by Hisasi. The B2 sized item goes for 1,000yen.
Hisasi's end card was featured on episode 5
And there's a illustration book, with works from artists like
Kimo, as seen in a series end card
by Tamori Tadadi
Bag from the Production I.G
Meanwhile, Good Smile Company had some goodies to show at last weekend's Wonder Festival figures event
Other works from the figure expo