Hige to deko - Isekai Transmission ver.1.04 (jap) - Adult Sex Game

On a strange remote island, a warp device is being developed.
However, while the device is still in the preparation stages, it connects with another world.
As strange monsters pour from the apparatus, it's up to Rio, the warp device creator's granddaughter,
and Fuyuko, an exorcist, to protect the citizens of the island.