About the Oh My Goddess! Manga Volume 04

Ever since a cosmic phone call brought the literal young goddess Belldandy into college student Keiichi's residence, his personal life has been turned upside down, sideways, and sometimes even into strange dimensions! Half-goddess, half-demon, Belldandy's big sister Urd continues her campaign of naughtiness when she brews up a luuuuuv potion that, of course, goes horribly awry, infecting everyone but her poor intended target-Keiichi.