"Jiro-gaki" (Diospyros kaki) belongs to Ebenaceae (the Ebony family). It is a tall deciduous tree that is a variety discovered by Jiro Matsumoto at the end of the Edo period in Mori Town, Shizuoka Prefecture, Japan, where the raw timber still exists and is designated as a natural monument of the prefecture. Fruits are usually square, but very rarely pentagonal. Due to its dense flesh and strong sweetness, it is one of the two major varieties of sweet persimmon that is distributed on the market along with Fuyu-gaki. The northern part of Hamamatsu City, Shizuoka Prefecture is the main production area, and Shizuoka Prefecture has the highest shipment volume in Japan.