Eiko Kadono, the author behind Japan’s most famous – and almost certainly most beloved – literary witch, has a little trouble going up the stairs these days.At 91, she is still writing every day and has not stopped loving the colour pink, dressing up or believing in the magic of books.Kiki’s Delivery Service, which was published in 1985 and turned into a 1989 animation by Hayao Miyazaki’s Studio Ghibli, is among more than 200 books she has written.“I never tire of writing,” she says at her home in the picturesque seaside town of Kamakura, south of Tokyo.With a little pink gate, the house is filled with books, pink chairs and her collection of animal figures.“I’m probably a child at heart,” Kadono says with a small laugh.