Nijihara Ink is a normal girl who goes to a normal high school, and she's blessed with a not-so-normal underdeveloped body. One day, Ink meets a talking duck. Ink takes "Ark-kun" home and discovers that he is actually a powerful magician cursed into the form of a duck. Ark-kun then convinces Ink to become a Magical Girl in order to help others. Thus begins the moe adventures of Pastel Ink.