Dude has nobody but himself to blame for this situation he's in. And he's lucky that his school was apparently one big egg carton. Though this is one of Fukuoka Taro's work, of course every guy is a happy cute girl waiting to happen.
Protagonist clearly had no plan for what happens next after converting his school. If he just wanted to be around girls all the time, well, there is indeed a way for him to have one present even when totally alone...