Many historical documents about mikomai in the medieval period have been kept at Kibitsu-jinja Shrine in Bizen Province (Okayama Prefecture), and according to one documents named "Ichinomiyasha ho" written in 1342, Ichinomiya (i.e. Kibitsu-jinja Shrine) retained 'mikoza' (literally, 'a group of miko') composed of twelve shrine maidens, some of whom were dispatched to offer Kagura at local shrines upon request, while Ichinomiya also received shrine maidens from local shrines to dance Kagura at Ichinomiya.
中世の巫女舞に関する多くの史料が残されている備前国（岡山県）の吉備津神社の例では、1342年（康永元年/興国3年）作成の『一宮社法』によれば、一宮（吉備津神社）には12名の巫女からなる「神子座」があり、一宮の行事以外でも村々の招きに応じて神楽を舞い、逆に村々の巫女が一宮で舞う事があった。