Kono Mune no Naka Ikite... ~Find Love EX 2~

In 194X Japan surrenders to the USA and gets occupied leaving only reservations for the Japanese. Forced labor became a commonplace. In addition, USA command center secretly conducts sexual experiments to nurture high psychic ability. One of such experiment subjects is girl Ruriko.
Main character is rescued from forced labor camp in coal mine by the resistance. He now fights the occupational forces as well. But at the same time he gets deeply involved with Ruriko...

[From vndbreview]