Jun Mochizuki is best known as the author of Pandora Hearts and The Case Study of Vanitas. Mochizuki was born on December 22 in Kanagawa Prefecture. Her first work was a one-shot titled Pandora Hearts. Following this publication through Square Enix, she launched Crimson-Shell, serialized from Sep 2005 to Feb 2006. Following Crimson-Shell's completion, she launched Pandora Hearts, different from the previous oneshot.