Honoo no Haramase Tenkousei
Japanese title: 炎の孕ませ転校生
Alternative titles: Honoo no Haramase Tenkousei Ue, Flaming Impregnating Transfer Student
Type: OVA
Source: Visual novel
Episodes: 3
Status: Finished Airing
Aired: Oct 27, 2006 to Jul 27, 2007
Duration: 29 min per ep
Rating: Rx - Hentai
Studios: T-Rex
Producers: Himajin Planning
Genres: Hentai
Themes: Harem, School

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: ANN)