The first two volumes of the shoujo manga classics Yuukan Kurabu created by Yukari Ichijo (一条ゆかり), and originally published in the 1980s. 
It received the 1986 Kodansha Manga Award for the shoujo category. This is the digital coloured version of the manga released by Shueisha in 2019.
Title: Yuukan Kurabu (有閑倶楽部) / Yukan Club / The Leisure Club / Club for the Leisure Class
Genre: comedy
Publisher: Shueisha
Source: purchased by me at www.ebookjapan.jp.
Language: Japanese (raw)
Volumes: 19 (complete)
Volume 1 
Download »126.73 MB
Volume 2 Download »139.49 MB
Description (from Baka-Updates):
St. President school is one of the most prestigious schools around. Everybody in this school respects the Yuukan club, the richest and most popular group in the school. Its members – Shouchikubai Miroku, Kenbishi Yuuri, Kikumasamune Seishirou, Hakushika Noriko and Kizakura Karen – go through dangerous adventures to save their schoolmates and, of course, to kill time.