Honoo no Haramase Tenkousei

The main character, Tatsuya Tagami, has an ambition of World Conquest, and the first step of his plan is to make every female classmate pregnant. Unfortunately, his dream is rather impossible in his all-boys school. Hence, he transfers himself to the newly reorganized Hakuka Co-Ed Academy, which was previously an all-girls school.

(Source: Anime News Network)