Kekkon Shiyou yo! Osananajimi wa Nekoka Juujin

A feline beast person named Eta recalls a childhood promise to marry Souta, who appears to have forgotten it as they enter high school. The story includes three separate arcs: one centered around Eta's unresolved feelings and marriage proposal, another involving a character named Otori, and a third focusing on Eta's first experience with someone named Ushi-kun.