A cast announcement has been made for the fourth film in the K: Seven Stories series, Lost Small World ~Ori no Mukō ni (To the Other Side of the Cage):
- Yui Ogura is Aya Oogai
- Shinichiro Miki is Niki Fushimi
- Satomi Akesaka is Kisa Fushimi
The first film in the six-part project, R:B ~Blaze~, will open in Japanese theaters on July 7, 2018.