 If you liked
Kanojo ga Flag wo Oraretara
|
 ...then you might like
Murenase! Seton Gakuen
|
Both have different character gimmicks which leads to all kinds of comedic interactions.
Both have friend groups that just grow in number and results in camaraderie.
Both have main characters who didn't want to have such friend groups at first.
Basically, both have the same formula but with different styles and settings.