Ninna follows Gangyō
Ninna (仁和) was a Japanese era name (年号, nengō, "year name") after Gangyō and before Kanpyō.  This period spanned the years from February 885 through April 889. The reigning emperors were Kōkō-tennō (光孝天皇) and Uda-tennō (宇多天皇).Change of era
January 20, 885 Ninna gannen (仁和元年): The new era name was created to mark an event or series of events. The previous era ended and the new one commenced in Gangyō 9, on the 21st day of the 2nd month of 885.