This is a duplicate, incorrect or outdated name for H. 'Kinakafu Nagaba Mizu'.

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), the term nagaba as narrow long leaf(ed). and the term mizu as water, 'Mizu Gibōshi' or H. longissima.