After the death of his grandfather, Rintaro is devastated and alone. It seems he will have to close their tiny second-hand bookshop crammed full of wonderful books. Then, a talking tabby cat appears and asks Rintaro for help. The cat needs a book lover to join him on a mission. This odd couple will go on three magical adventures to save books from people who have imprisoned, mistreated and betrayed them before there is one last rescue that Rintaro must attempt alone…