Studio DEEN (スタジオディーン Sutajiodīn) is an anime production studio that has produced adaptations of several 07th Expansion works.
- Higurashi When They Cry (adapts the Question Arcs, Meakashi-hen, and Tsumihoroboshi-hen, 2006)
- Nekogoroshi-hen (OVA adapted from a light novel, 2007)
- Higurashi When They Cry Kai (includes an exclusive arc and adapts Minagoroshi-hen and Matsuribayashi-hen, 2007)
- UraHigu (short parody series)
- Higurashi When They Cry Rei (OVA series adapted from the namesake VN, 2009)
- Higurashi no Naku Koro ni Kira (OVA series with original content, 2011 - 2012)
- Higurashi no Naku Koro ni Kaku: Outbreak (OVA adapted from a short story included in Higurashi Daybreak Original Soundtrack, 2013)
Chiaki Kon (今 千秋 Kon Chiaki) is the director of Higurashi When They Cry, Higurashi When They Cry Kai, and Umineko: When They Cry. She "appears" in the 19th episode of UraHigu, the parody series of Kai; the scene is later reused as an easter egg in second and third episodes of the Umineko anime.
Toshifumi Kawase (川瀬 敏文 Kawase Toshifumi) is the director of Higurashi When They Cry Rei and Higurashi no Naku Koro ni Kaku: Outbreak and the series composer of all five When They Cry animated series from DEEN.