Hiiragi-senpai to Ofutari-sama

Tired of having to change schools because of her dad's job, Moemi, a first-year high school student, is allowed to stay behind at her parents' home on the condition that she lives with the daughter of her dad's boss. This girl, however, ends up being... a boy! And not just any boy, but one of the most handsome and popular boys at school! Moemi's formerly humdrum life becomes anything but as she traverses the excitement of living with a hot upperclassman!

(Source: Seven Seas Entertainment)