Asa: The Girl Who Turned into a Pair of Chopsticks by Natsuko Imamura

Asa tries to give her classmate a biscuit. Nami evades her classmates' playground game of acorn-throwing. Happy decides she's not interested in doing anything other than lying down on her sofa. Each of these three stories begins in a reasonable place-but by the end you'll find yourself in another world altogether.
Binding: Paperback / softback