Sotozura Danshi No Shimizu-kun

Awkward high school student Koharu Minami is in love with Shimizu, the popular boy in her class. So she's shocked when she inadvertently discovers that his friendly demeanor is all an act. Or is it? The more time they spend time together, the more Koharu notices the kindness hidden behind the constant teasing and disgruntled comments. Could finding out about "the real Shimizu" actually end up bringing the two closer together?!

(Source: MangaPlaza)

Includes two extra chapters.