Stefanie Joosten was born in Roermond, Limburg, in the southeastern Netherlands. She attended the Bisschoppelijk College Broekhin in Roermond, where she followed a bilingual (Dutch and English) course. Claiming to have been obsessed with the otaku culture since she was young, Joosten decided to study Japanese language and culture at Leiden University. In 2009, she went to Kyoto for a year as part of an exchange program. It was after this experience that she decided she would move to Tokyo after earning her degree back in the Netherlands.