The Haganai and Seitokai Crossover is a two-chapter long crossover series. The characters from Boku wa Tomodachi ga Sukunai and Seitokai no Ichizon visit one anothers clubrooms in this two chapter mini-series. It is authored by Yomi Hirasaka and Sekina Aoi. Its original publishers were Kodakawa Shoten and Media Factory in 2012. It was serialized in Comic Alive and Dragon Magazine.
The Neighbor's Club gets a mysterious message from a certain student council! This chapter was illustrated by Itachi, the artist of the Haganai manga.
The Hekiyou Gakuen student council receives an invitation from the Neighbor's Club to visit. This chapter was illustrated by 10mo, the artist of the Seitokai no Ichizon manga.
- None of the two series male characters make an appearance in either chapter.