Flagger no Houteishiki

Do you want to live your life like the main character of a love-romance anime? With the "Flagger" system, you can! Toujou Ryoichi lived a life consisting of no drama and no excitement. Everyday, he lived life like a normal high school boy. One day, he finds out from the creator of the "Flagger" system that he has been selected to be the debugger tester for this new system. With this system, he may be able to become the main story of his world and capture the heart of his secret crush: Satou Keiko. Because of this system, his parents suddenly move out of the country, and mysterious girls begins living with him, and his relationship with Keiko comes to a dramatic end!

(Source: MangaHelpers)