Unification of Japan Episode Collection I: A Patriarch's Love was released on February 25, 2021.

Unification of Japan Episode Collection I: A Patriarch's Love was directed by Hiroyuki Tsuji.

Unification of Japan Episode Collection I: A Patriarch's Love has a runtime of 67m.

Nakajima (Yoshimi Tachi) returns to the office for the first time since the end of the self-isolation period. He urges everyone to sanitize and keep social distance, but the other members act like nothing’s changed. Unable to hide his frustration, Nakajima is further thrown off by Himuro (Yasukaze Motomiya), who also seems completely unfazed. In the midst of this, a letter arrives for Himuro—from Hayato Omiya, currently serving time in prison.

The key characters in Unification of Japan Episode Collection I: A Patriarch's Love are Yasukaze Motomiya, Yoshiyuki Yamaguchi, Yoshimi Tachi.