Adult PC Game: Prison Girl Ver.1.0 by Yumenamakonn Archive

A young archeologist, Tania is conducting fieldwork at a place called Frontier.
She successfully finds a remnant of an ancient civilization, but due to the remnant's
curse, she gets confined within Frontier. In order to escape from Frontier, she has
to discover the Four Treasures which are stored in dens of greedy ones...