Yaichi-kun wa Caramel Taishitsu

Anzu, who doesn't understand what love is all about, agrees to try out becoming a couple with her childhood friend, Yaichi. Just where will this relationship, between the hot, sweet but easy to burn (caramel) high-school boy Yaichi, and the romantically indifferent Anzu, end up...?!

(Source: COMICSMART, translated)