Classical music takes a dramatic turn when high school students Kanae and Sosuke stumble upon a mysterious mansion where they encounter fantastical, miniature versions of renowned musicians from the past. As these Classicaloids bring their unique sounds to life, strange occurrences unfold, and the duo soon finds themselves entangled in a growing web of danger as more of these enigmatic beings appear, including Liszt, Bach, Chopin, and Schubert.

ClassicaLoid
Classicaloid versions of Beethoven and Mozart are discovered by high school students Kanae and Sosuke at Otowa Mansion, an ancient family estate in Hamamatsu, Japan.