Yukiko Kai (花郁 悠紀子, Kai Yukiko, 21 September 1954 - 12 December 1980) was a Japanese shōjo manga artist. Her real name was Kimiko Kaihatsu (開発 公子, Kaihatsu Kimiko). She is considered a member of the Post Year 24 Group. Although she died young, her works are still analyzed. Manga artist Akiko Hatsu is her younger sister.
Source: “Yukiko Kai”, English Wikipedia (CC BY-SA 4.0), excerpt