Based on Adult Game by Atelier Kaguya BerkshireYorkshire.

Touya's father suddenly went on a business trip and left home for some time. At that time, Touya's father had called 4 beautiful Private Teachers who would teach and keep Touya during the summer while his father was not around. Touya is surrounded by 4 Beautiful Teachers. Then, what will happen to Touya with these four beautiful Private Teachers?

(Source: Nekopoi and Has Been Translated)