About “Blue Flag”
Blue Flag is a Japanese manga series written and illustrated by Kaito, the creator of Cross Manage. It was serialized digitally on Shōnen Jump+ from February 2017 to April 2020. Shueisha later collected the chapters into eight tankōbon volumes. The story is a slice-of-life manga set in a high school. It follows a group of friends as they deal with personal challenges, societal pressures, and their emotions toward one another. (Summary adapted from Wikipedia, CC BY-SA 4.0.)
Some summaries adapted from Wikipedia, CC BY-SA 4.0.