Orange Kakumei 

Our always bright and cheerful heroine, Nat-chan, finds herself faced with a serious problem! She’s crushing on a guy who already has a girlfriend! Oh, what’s a girl supposed to do? Well, join the Sports Day Committee in order to be close to him of course. But things don’t turn out the way she expects as she runs into a few problems, one of them namely Sakaguchi Touya. He doesn’t just bother her by confessing his love for her everyday, even worse, he steals her dessert every lunch hour! Includes another short story called Sunflower Carnival.