Koryû is a packaging design concept for a premium sake.
Koryu (古流 koryū) is a Japanese word that is used in association with the ancient Japanese martial arts. This word literally translates as "old school" or "old tradition". It was also the name of Kusunoki Masashige's sword: made by Osafune Kagemitsu arround the 1320s.
The nickname of this sword was little dragon.