English: http://e-hentai.fbk.tokyo/index/g/1669056/54b78ed105/
Gears' Maiden 1 (raw): http://e-hentai.fbk.tokyo/index/g/1331488/95fcf3c9ce/
Gears' Maiden 1 (English): http://e-hentai.fbk.tokyo/index/g/1580699/d7f6bba999/

High-resolution scans of Gears' Maiden 2, originally released on the 15th of August 2010 at Comiket by Akihito Tsukushi (now the author of Made in Abyss).

All pages are lossless PNG files except page 31 (the next-to-last page, the one with copyright info), which was downscaled by 50% and is a compressed JPG file at quality level 95 to accommodate the upload limits here.

Scanned by Council of Scans.

If you want to translate the doujin into your language, you can get a redrawn version with the text removed: just ask Azrapse#8268 or Alpatron#6158 of Council of Scans on Discord (sending me a message through e-hentai will also probably work, but I don't check the mail often, so expect a delay if you do).