Kimi Ni Happiness

From Leaping into Puddles:
Bouyant girl Aizawa Yume falls for the cool boy in her class, Kashiwagi Kou- who tickles people’s noses with a sweet scent and only smiles from time to time. Slowly, Yume develops feelings for Kou-kun… but one day after school, she catches him with Hitohana-san, the girl with a bad personality and equally bad reputation!