Lost in Endoria: Monster Girls - v0.8.95d Demo by Yukari-chan - Adult Sex Game

What would happen if a frail nerdy guy got transported and isekai’d into a world full of monster girls?
And what would happen if they all figured out that this nerdy guy, the only male in their world,
has the power to make every monster girl strong by eating his semen?
Will they free him and allow him to return to his world?