Sakurako Gokurakuin is a famous manga artist/illustrator in Japan, known mostly for her shounen-ai works (both professional and doujin). Her simple and beautiful style caught the eye of Broccoli and was hired to draw the posters of a new trading card game series called Juvenile Orion. Juvenile Orion then grew into a series of merchandise and a manga series.

Marekatsu Nakai was born 1971 in Yamanashi prefecture, Japan. In 1999, he was hired by Broccoli to make an all-new original trading card game called Aquarian Age. Since then, he has been a famous game designer and novelist for the popular series.