School Days: Magical Heart Kokoro-chan
School Days : Magical Heart Kokoro-chan ／ School Days OVA ／ School Days ~マジカルハート☆こころちゃん~ ／ School Days ～マジカルハート☆こころちゃん～ ／ School Days: Magical Heart Kokoro ／ School Days: Magical Heart☆Kokoro-chan ／ schooldays ova 2 ／ Шкільні дні: магічне серце☆Кокоро-чан
Description
Originally an April's Fool in 2007, this one episode OVA is a spin-off of the School Days game by 0verflow, and shows Kokoro Katsura, the little sister of one of the main characters, from her other side. A mahou shoujo out to save the world, or something like that. (Source: AniDB)