Hana to Yume

From THEMWiki

Hana to Yume (花とゆめ) is a shoujo manga magazine targeted at teenage girls. It is published by Hakusensha, and began publication in the late seventies. The manga Glass Mask greatly boosted the popularity of Hana to Yume when it first began its run in 1978. And like the Neverending Story, it has yet to end.

Some other manga you might know, such as Fruits Basket, Angel Sanctuary, and HanaKimi also ran in Hana to Yume.