Special episode 12.1 of Kemono Friends, streamed online.

Incorporating the earlier two parts and adding additional footage as an epilogue, Keifuku-san features the adventures of a young girl in a railway conductor uniform and a floating manta ray as they explore an otherworldly space. The video features direction by Tatsuki, animation by Hirayasu, and art by Yukko (all members of animation studio irodori), as well as the voice talents of Yumiri Hanamori. (Source: Crunchyroll)

The OVA will be focus on when Kujaku Nijou first entering group, which occurs one year before the main anime begins.

Japan's latest competitive sport, keijo, is dictated by a simple set of rules: female-only participants must stand on circular platforms floating in a pool—referred to as lands—with the goal being to knocking off opponents using only their breasts and butts. Despite this outlandish premise, the sport attracts millions of viewers across the country and boasts a lavish prize pool. Many aspiring athletes take up the challenge in hopes of becoming the next national champion. After graduating from high school, the lively 17-year-old Nozomi Kaminashi enters the world of keijo, hoping to bring home a fortune to her poor family. As a gifted gymnast, Nozomi quickly proves herself a tough competitor after stealing the spotlight in her debut tournament. Meeting new friends and rivals as she climbs the ranks, Nozomi discovers that the path to stardom as a keijo player is filled with intense competition that will challenge not only her body, but also her soul.