Use (a Japanese P2P program) or Panda Portal (a BBS archive). Search 「さくらサークル ガキに戻って フリー」. This is advanced and requires a Japanese IP resolver, but this is where the uncensored, high-quality rips live.
The manga explores several themes, including: sakuracircle gaki ni modotte yarinaoshi free
Occasionally, fan groups translate these games. They do not distribute the game itself but provide a patch file. You would need to obtain a legitimate copy of the game (sometimes as cheap as $5-$10 on DLsite) and then apply the free translation patch. Use (a Japanese P2P program) or Panda Portal (a BBS archive)