18+ Silicon☆Magic: Umareru Mae kara Anata Senyou

The protagonist is the only son to the head of a large conglomerate and lives his life in a large mansion estate with his father often away on business. However, he has a great phobia of women and finds it impossible to have physical contact with them. So even though he is often in the company of the elegant daughters of the elite, he can do nothing, but shy away from their advances. The only girl he was ever comfortable around is his osananajimi and maid Sumire, but that is about to change as his three most beloved onaholes; Theta, Mu, and Phi come to life as real girls and start their new lives as his maids.

(Source: VNDB)