The treasures from Comic-Con are still trickling in! Here's an interview with Moto Hagio, one of the pioneering creators of shojo manga (those written for teen and preteen girls.)
When I first started working as a professional manga artist, a lot of my stories had people dying and other sad endings. My first editor at Kodansha tried to stop me from drawing such grim material. So I tried to make my stories more cheerful, but he still said, “Too dark!” Then Junya Yamamoto took a liking to my work. He let me draw whatever I wanted, even if it was too dark.