Another short story might revolve around a character's personal struggle, like one of the girls trying to overcome her shyness in expressing her feelings. It could show her internal thoughts as she tries to be more open with her friends or a special someone, and the steps she takes to grow and change in this regard.
One interesting short story from 'Strawberry Panic' could be about the early days of the characters' friendships at the school. It might show how they first met and the initial impressions they had of each other.
There could be a short story that focuses on a particular event like a school festival in the 'Strawberry Panic' world. It would detail the preparations the characters made, their hopes and fears for the event, and how it ultimately turned out. For example, how different groups of students competed in various festival activities, and how the relationships between the characters evolved during this time.