A student of Arashigaoka Academy. Also, Tsubaki Kureha's only lover when Sumika was alive. Izumino Sumika was mauled by a bear. Yurizono Mitsuko ate her while Yurishiro Ginko witness her demise. At the last episode, Lady Kumaria has taken Izumino's persona, with bear features, and granted Tsubaki her wish. She is actually Kumaria-sama herself.