Futari Gakkou: Zenkou Seito 2-mei, Kataomoi

Only two students in the entire school, and a crush on one another. No rivals! Makura-chan transfers from a city school to a rural school. But her new school is a rural school with only two students, including herself. Her only classmate, Mu-chan, is a clumsy and laid-back boy. But Makura-chan finds herself drawn to him for some reason...? A lighthearted and heartwarming romantic comedy about two people who are all alone!

(Source: Comic Ambre, translated)