Kuze-kun Waruikoto Shicha Dame

From Chibi Manga:

Natsu wishes to lead a peaceful high school life. However, in an unexpected turn of events, she became the girlfriend of Kuze Reito, who is rumored to be the strongest in a fight and the number one ikemen of the school. And ignoring the flustered Natsu, he declared in front of the whole class that they were 'going out'...!? What will happen to Natsu's peaceful school life...!? An enthralling school love story with a wild Kuze-kun's sweet teasing!