Inma no Meikyuu Hikyou no Chika Iseki ni Kodaibunmei no Injuu o Mita!!

A herd of erotic monsters deep inside the relic... Laying egg, breeding... The fear of impregnation strikes the heroine's heart!! The professor, the protagonist of this story, eventually found the hidden place where the monsters dwell... Would they come back alive? [Edited from DLSite English]