A Swan for the Cat, Gold for the Firefly

Art teacher Hase Hotaru is confounded by one of her students, Nekome Yuna. Yuna fell in love at first sight with Shiratori Ako, a part-time teacher at the same school, and she is aggressive in her pursuit. However, Ako has quirks of her own, and her true feelings are inscrutable. The story of a student's unrequited love and the unexpected effects on the adults around her. (Source: Kadokawa, translated)