The main character, Arshile, has no memory of his past and wanders around Europe with his only acquintance, Cartis. One day, they are unexpectedly invited to a cruise ship called the Fanatica.

"You still don't remember anything? If things stay like this, will the game fail? Or maybe you still haven't found someone who really loves you?"

Words left behind by a mysterious man on the ship.

Soon after this, near the end of their trip, Arshile is kidnapped and wakes up in a palace cut off from the outside world. There, he remembers the sins he committed in the past, the secret of his bloodline and... his deep love for a certain man.

On the night of the lunar eclipse, eternity begins.

[Translated from the official website]