Takeuchi said discussions with Kodansha originally envisaged a single story arc; the storyline was developed in meetings a year before serialization began. After completing the arc, Toei and Kodansha asked Takeuchi to continue the series. She wrote four more story arcs, which were often published simultaneously with the five corresponding seasons of the anime adaptation. The anime ran one or two months behind the manga. As a result, the anime follows the storyline of the manga fairly closely, although there are deviations. Takeuchi later said because Toei's production staff were mostly male, she feels the anime has "a slight male perspective."