This cultivar comes from Japan. Some sources call it H. longissima var. longifolia 'Kinakafu Otome' which was recently changed to H. 'Ki Nakafu Otome'  It starts the spring as a yellow leaf with a green margin but usually turns all green by late July.

Mikiko Lockwood in an article on The Hosta Library titled, A Little About Japanese Hosta Terms defines the term kinakafu or ki nakifu as yellow-center(ed) and the term otome as maiden, 'Otome Gibōshi' or H. venusta.