While this story is titled Blue Friend 2nd Season, the only direct similarities it bears with that series are the same author and publisher. It is not a sequel to that story.

It's Shimizu Kanako's first day at an all-girls high school, and she's a little overwhelmed. Hoping to make new friends, she bumps into the odd and distant Kamei Ao, as well as her first three new friends: Aki, Rikako and Haruna. Of course, not all can be so sweet in the world of girls.