Shiiko Love ~Usugurai Heya no Naka de Shoujo o Model ni Eroge Seisaku~

It's your 30th birthday and you've yet to have a girlfriend. You often chat on 2chan about your problems and with Sachie a woman you knew from work. One day you're introduced to Shiiko, a beautiful 10 year old grade school girl. Before you know it, you're already having sex!

After Shiiko becomes your girlfriend you meet the Dream Guru who demands that you make something of your life or you'll die. He gives you a time limit of 15 days. You decide to make your own eroge and since Shiiko is your lover you ask her to be your model and she agrees!