Suki Ni Naru To Wa Nanigoto Da (Offical)

From Renta!:

Swim team star Masaru Shiraoka and student council member Haruto Onuki get along like oil and water, but an unexpected encounter in the locker room results in the two of them seeing each other in a very different light… Just where is the path of these former enemies gonna lead…!? This is a romantic high school comedy featuring an unlikely couple.