Futaribeya: A Room For Two Vol. 1 (manga)

As her exciting first year of high school begins, Sakurako Kawawa settles into her new lodgings. There she meets her roomate, the stunningly beautiful Kasumi Yamabuki, who lives life at her own pace. From day one, responsible, level-headed Sakurako and lazy, easygoing Kasumi find themselves at odds with one another...But with their matching mugs and one bed to share, Sakurako and Kasumi's friendship is just the beginning!