Monogatari Series: Off & Monster Season - Zankoku Douwa: Utsukushi-hime

About six hundred years ago, in a kingdom long since erased from the world, there lived a princess whose extraordinary beauty drew people from far away just to see her and offer gifts. Yet she suffered because no one cared to know the person beneath her appearance, so she asked an old witch to make the beauty of her heart visible as well.

The wish is granted in a horrifying form: anyone who sees her inner beauty becomes willing to give up their life for her. As death gathers around the princess, the wish to be truly understood turns into a curse that cuts her off from other people, transforming a tale of perfect beauty into something far crueler.