Even though this story is from the past, things like big breasted milfs are timeless! FAKKU is back with a prehistoric tale that was almost lost to time, The Otaku in 10,000 B.C. by Nagashima Chousuke 

Our first Isekai release is centered around a hopeless otaku named Ota. Unlucky at love and with nothing going his way, Ota's world is turned over when he’s magically transported into a land that time forgot. Surrounded by nurturing, big breasted cavewomen with seductive banging bodies, Ota’s going to have his hands full teaching them a bunch of firsts in the history of sex! 

(Source: Fakku)

After witnessing his favourite idol sleeping with another man, Ota slips through a crack in time and finds himself transported to 2200A.D.
 
After being confused for as a Sex-Bot, Ota must join hands with the resistance to fight against a supremacist government.

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