Mauricio de Sousa and Osamu Tezuka were friends and have been planning to make a joint project before Osamu Tezuka died. In 2013, Mauricio de Sousa launched a crossover story with his and a few of Osamu's characters, including Monica (from Turma da Mônica Jovem) and Sapphire (from Ribbon no Kishi), which was allowed by Tezuka Productions. Hence this official art.
