A high class all girls school that grooms their students to become a proper lady with manners… or so it should’ve been. But somehow the public morals is a bit loose… the proud honour student, lily is giving the students [freedom] in the school?!
Black Lily to Shirayuri-chan is a completed manga by Ootori Mahiro, first published in 2016. It blends comedy, girls' love, drama and slice of life. You can read all 23 available chapters of Black Lily to Shirayuri-chan online for free on MangaPulse; the newest is Chapter 23, added 2019-06-01. The series is finished, so you can read it from start to end in one go.