From official description: "Images of Maetel (Galaxy Express 999), Yuki Mori (Space Battleship Yamato) and Emeraldas (Space Pirate Captain Harlock/Queen Emeraldas) are selected from the "Hot Lips" doujinshi series and made into color". Not sure what the mean by series, I see one dojin: https://e-hentai.org/g/326129/3f48417306/ Through it's based on a doujin, I think it classifies as artist cg?

The gallery has some story in html format, which is not supported by the galleries. If you want it, pay the few bucks and get the gallery (or if you are an established TL, PM me and we can work out something).

Support the artist:
http://www.dlsite.com/ecchi-eng/work/=/product_id/RE050768.html
http://www.dlsite.com/maniax/work/=/product_id/RJ050768.html

Visit their website:
http://www007.upp.so-net.ne.jp/okachimentaiko/

E-hentai tip of the gallery:

9) You can turn on many features, including "no ads", and access to more galleries, by acquiring "hath". See the feature list at https://e-hentai.org/hathperks.php , and get your hath from https://e-hentai.org/exchange.php?t=hath

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EHCOVE is looking for a scanner in Japan who can order dojins from Japanese stores like nagomiweb.jp and scan them for me. Willing to pay commission fee on top of covering purchase and delivery costs (and the scanner keeps the books). Can pay through PayPal/Neteller. PM me if interested.

「日本のサイト（Nagomiweb.jp など）で同人誌を購入してスキャンすることができる人を募集中です。手数料、および購入する際の費用はこちらが払います（あと、購入された同人誌はスキャンする人のものとなります）。支払はPayPal・Neteller を通過して行います。興味があるのでしたら、私にPMしてください。」