"Nekopara: Koneko no Hi no Yakusoku" is a short anime series that expands on the world of the popular "Nekopara" visual novel franchise. The story is set in a world where humanoid catgirls, known as "Nekos," coexist with humans. The narrative centers around Kashou Minaduki, a young patissier who moves out of his family home to open his own pastry shop, La Soleil. He is accompanied by two Nekos, Chocola and Vanilla, who were raised by his family and decide to follow him to help with the shop.

The series primarily explores the daily lives of Kashou and the Nekos as they navigate the challenges of running a bakery while maintaining their close-knit relationships. Chocola, a cheerful and energetic Neko, often takes the lead in assisting Kashou, while Vanilla, more reserved and thoughtful, provides a calming presence. Their interactions highlight the bond between humans and Nekos, as well as the unique dynamics within their group.

As the story progresses, other Nekos from Kashou's family, including Azuki, Maple, Cinnamon, and Coconut, visit the shop, each bringing their distinct personalities and quirks. These visits add variety to the narrative, showcasing the playful and sometimes chaotic nature of their interactions. The series also touches on themes of responsibility, family, and the importance of communication, as Kashou strives to balance his professional aspirations with his care for the Nekos.

The plot is lighthearted and episodic, focusing on slice-of-life moments and comedic situations rather than a central overarching conflict. The Nekos' antics, combined with the warm and inviting atmosphere of La Soleil, create a charming and wholesome viewing experience. The series serves as a gentle introduction to the "Nekopara" universe, emphasizing the bonds between its characters and the joy they find in their shared lives.