Nico lives in a fairytale picture book that Miyuki picked up from a cart of picture books when she was younger. Being curious, Miyuki began to read it. Nico's words in the book helped her to understand "The key to becoming friends is to smile", and allowed Miyuki to find some friends. Miyuki promised to finish the book, which the last few pages were tore off. She drew a lot of pictures, but Miyuki lacked drawing skills. Eventually, she gave up and lost memory of it.
(Source: Pretty Cure Wiki)
