Winter Tale ~Shiro no Kyouai Kuro no Injoku~

Mikami Satoshi is caught in a snowstorm. He manages to find shelter at a nearby mansion.
In the mansion he meets two women who call themselves Aries and Erias.
Though he was going to stay only a short while, Satoshi finds himself fascinated by the women's secret.
Was their meeting mere chance? Or was it destiny?
The gears of fate are slowly starting to grind together...

[From DLsite English]