H3 School "Happy Hustle High" 5 volumes-complete by Rie Takada
Hanabi's all-girl school merged with an all-boy school. She's her classmates only hope in facing the boy's student council. The heroine is tomboyish but she turned out to be a loveable character. The story is about the ups and downs in a relationship. There's no major conflict or drama or anything. They fight over silly petty things like any other first highschool romance which makes it unassuming. I havn't had a great laugh such like this for a long time. There's also a PG-13 disclaimer from the mangaka.