Le Portrait de Petite Cossette Season 1

Eiri works at his uncle's antique shop, and one day stumbles across a glass. Upon touching the glass, he receives visions from what he finds out to be a girl, Cossette, haunting the glass. She's been searching for over 250 years for someone who could see her, and now she needs his help.

Eiri is tortured mentally and physically by Cossette, who demands that he prove his professed love for her. It is revealed that Eiri is the reincarnation of Marcello, and that Cossette is becoming as infatuated with him as he is with her.

Will Eiri see past all the illusions and discover the tragic truth about Cossette, or will he be consumed by anguish and obsession?