Nekopara Vol.1 was a game that I found engaging and intriguing when I read it, despite the fact that it was primarily a fan service game. The reason that I found it engaging was because it put such an emphasis on background information as to why a world with catgirls exists and how such a world works. Furthermore, it had a strong backstory for both our main character and portrayed a strong and well developed relationship between him and his two catgirls Chocola and Vanilla.
Disclaimer: Some versions of Nekopara Vol. 2 contain pornographic content that is not intended for anyone under the age of 18 or whatever the legal age in one’s country is. Additionally, there is an image that will likely be considered NSFW.