This sport of the species, H. longissima is a non-registered cultivar from Japan. The plant forms a small size (6 inches high by 9 inches wide) mound with narrow foliage which has a shiny on top and bottom. The dark green leaves have a yellow marginal variegation and are narrowly elliptic (strap-shaped), smooth textured without waves. It has average substance. Flowers are medium purple in color with purple anthers and are borne from mid-September to October.

Mikiko Lockwood in an article on The Hosta Library titled, A Little About Japanese Hosta Terms defines the term kifukurin or ki fukurin as yellow edge(d) or yellow margin(ed) and the term mizu as water, 'Mizu Gibōshi' or H. longissima.