Bijutsushitsu no Monsters Monsters in the Art Room

Synopsis

Blake is a high school girl who isn't very good at talking to others. At school, she tends to end up at one spot, "an art room where no one else comes." Yet one day, a monster girl suddenly appears in the room, and it seems as if she's after the artwork in the room... A story where a girl and a monster communicate to each other through "art" begins. (Source: Shogakukan, translated)