The Star of Cottonland was serialized by a magazine that is published when?
The Star of Cottonland: The Star of Cottonland (綿の国星 , Wata no Kuni Hoshi ) is a shōjo manga by Yumiko Ōshima. The Star of Cottonland:  It was serialized by Hakusensha in "LaLa" magazine from 1978 to 1987 and collected in seven "tankōbon" volumes. LaLa: LaLa is a monthly Japanese "shōjo" manga magazine published by Hakusensha. LaLa:  The magazine is published on the 24th of each month.
the 24th of each month