Agate, a demon girl doomed to live forever, attempts to erase her memories by plunging half of her head into a deep ravine and fleeing. Suddenly, her tears pour across the valley floor, coalescing into a lake that unleashes an infernal deluge. Aloys, the Ghost Prince, ventures to the mortal realm to uncover the mystery and ultimately encounters Agate, sparking a tale of existence and affection.
