Tsutaya.jp has updated with product info on a Zaregoto OVA Sound Collection to be released on October 25, 2017! It will include OST, 2 drama tracks, OP & ED.
Title: Kubikiri Saikuru: Aoiro Savan to Zaregototsukai Sound Collection
Release Date: October 25, 2017
Product Code: SVWC 70296
Number of Tracks: 36
thanks to elcazador for the news!
The 2 last episodes of the OVA are expected to be release on August 30 and September 27