Kusanagi's debut series, Yoiko no Kokoroe, was published in 2003 and serialized in Hakusensha's shōjo magazine, Hana to Yume.
In 2009, Kusanagi's longest-running series, Yona of the Dawn began serialization in Hana to Yume.
[1] Yona of the Dawn has remained as her most popular series and was adapted into an anime in 2014 by Studio Pierrot,[2] receiving a 24-episode series, an OVA episode in 2015, and an adaption of the Zeno Arc in 2016.
In 2002, Kusanagi's work Goshin Kyoudai ga Yuku!?
The following year, she won the 28th Hakusensha Athena New Face Award for Outstanding Debut with Yoiko no Kokoroe.