Gal to Ooyasan

Kotoha is a second-year high school student who puts all her energy into her part-time job, her studies, and her fashion sense. One day, when she returns to her boarding house, she finds out that Itsuki, a university student, is her temporary landlord!? Itsuki is great at cleaning, cooking, and being considerate, but Kotoha can't hide her excitement and confusion at his perfect landlord skills and his doting attitude!

A peaceful battle begins between an independent-minded honor student gal and a naturally charming university student...♡

(Source: Kadokawa, translated)