[1][2] From the time she was in high school, she assisted her older sister, professional manga artist Yukiko Kai.
[3] After graduating high school, she began working for a printing company in Kanazawa City, but she soon quit in order to become a full-time assistant to her sister.
[2][3] She also began to assist other professional artists, most notably Moto Hagio.
[1][4][6] The following year, Hatsu made her professional debut in the magazine ALLAN [7] with the short story "Elegy of the Waves" (波の挽歌, Nami no Banka).
[8] Hatsu served as an adjunct instructor at Kyoto Seika University until retiring in 2005 due to health issues.