Ura de Yancha-na Gouinda-san

Bonsuke Hirano, an exceptionally ordinary high school boy, returns to his homeroom after school to pick something up, only to find the school's number-one serene beauty, Kokuru Goinda, fidgeting around in his desk… "Huh? Does she…like me? Wait, maybe not?" A young man's naivety meets the full force of a gal's allure in this tantalizing tale of teen love!

(Source: MANGA UP!)