From Chibi Manga:

A cool and cunning guy, jun-kun has stolen a kiss away from momo! She supposes to be has no luck with love but a sweet storm has finally arrived!

Nitou Saya, a 15-year-old scaredy-cat with a weak presence, suddenly finds herself ambushed by the infamous delinquent Kasai Arata-kun. To make matters worse, she ends up kissing him accidentally - and their bodies swap! Will her life turn into an awful disaster or will this incident develop into an unexpected opportunity?