According to the official twitter, an unaired episode of Inu x Boku SS
was announced to be released in the seventh volume of the Blu-ray & DVD. It will consist of three short episodes newly written by the manga author Fujiwara Cocoa
. Fujiwara also designed a new character called Hana-chan for the episode.
Character design of "Hana-chan"
The seventh volume will be released in September.
Source: Inu x Boku official twitter
Inu x Boku SS Special