Is this an official release or...? Checked the Patreon and everything's in English, so I wouldn't be especially shocked if the author made a JP and a EN version.
the oficial version in jap ios here https://www.dmm.co.jp/mono/doujin/-/detail/=/cid=d_d0009978/?dmmref=aMonoDoujin_List/ - i only know this site this translation belong to old translate works, but that works sont have the cover, for more than 10 years the cover was missing so.. tha is waht is new
For those wanting a complete Tank or close to it - https://e-hentai.org/g/1009702/bee94747e1/ Unfortunately it's the old censored version and untranslated. There used to be a translated version but it's gone now.