They are quite similar as they involve familiar things like - having a crush , the thing with the photo, in Seishun cinderella, she tears the photo and goes back in time, in blue birthday, she lit up the photo and goes back in that particular moment. The stories might be quite different, but are so wholesome to watch.

Just like in' Dear.M' 'School 2017' also has the story about an anonymous person.
This story also shows the plot 'YOUTH', FRIENDSHIPS and RELATIONSHIPS.