The main character, “Tenmaru Kokoromo”, woke up in a cold sleep in a research facility.
Three hundred and fifty years had passed since Tenmaru had fallen asleep.
At the facility, he meets, “Roselle,” a winged sexaroid, and, “Dia,” an android who manages the facility.
The three tried to get out, but the door was tightly closed and they could not get out.
They have only two weeks' worth of food left.
They form an irreplaceable bond in the closed research facility.
A huge facility, artificial girls, and mysterious figures.
The hidden truth forces them to make a heartless choice.

[Translated from the official site]