Green Days

Green Days is a Japanese comic featuring
high-school students, bonsai, and a spirit of bonsai.

少年画報社→グリーンデイズ1巻(ムサシマル)本日入荷しました！ pic.twitter.com/R10QwgLQ3L

— SASAKI (@ms_book) 2015, 6月 17

 And its 1st volume is now on sale.