[Crossover + AOTU] The Strange-Tale Girl from Land of the Lustrous

Hey, have you heard the legend of Hanazono Asana, the Puppet Girl? If you bring a doll to the music room at exactly twelve noon and play the piano in the middle of the room, the Puppet Girl will appear. If you can play a tune that pleases her, she'll grant one wish without question. Of course, if she isn't pleased... She'll control the person who made the wish with her strings, turning them into a real puppet doll. Among the school's Eight Unsolved Mysteries, Hanazono Asana is undoubtedly the most inscrutable. Because of the second-oldest Misaki, she somehow ends up in all sorts of strange places. A certain tournament that takes people for all they're worth A vast, romantic demon-hunting organization in the Taisho era A miserable government agency that gets blamed for everything The baffling Holy Grail War She, Hanazono, has never wanted to return to the school she once thought was unbelievably boring so badly. A pretend-sickly supernatural-story girl: Hanazono, Asana, a name with no given name, only a surname I had too many stories I wanted to write, so after thinking it over, I decided to write a crossover. I'm so clever, hahaha~ Theme: All things with form will eventually fade