Pixie Pop: Gokkun Pucho: v. 1 by Ema Toyama
Mayu, the daughter of a cafe owner, is down-in-the-dumps unlucky in love--until she meets Puchyo, the magical fairy of beverages. Now, whenever Mayu drinks something, she transforms accordingly-milk makes her grow, water turns her invisible, and pork soup turns her into a cute little piglet. But what will help her win the man of her dreams?