Yukiko Horiguchi (?? ???, Horiguchi Yukiko, born 28 January 1983) is a Japanese animator and illustrator from Kyoto Prefecture, who used to work for the anime studio Kyoto Animation.
When illustrating a light novel, she uses pen name "Shiromizakana" (???).
She is best known as being the character designer for the anime adaptations of Lucky Star and K-On!, the anime original Tamako Market and for being the illustrator of the light novel Kokoro Connect.She is the older sister of BUNBUN (also known as abec), also a light novel illustrator, responsible for the illustration of the light novel Sword Art Online, Sword Art Online: Progressive, original character designer on the anime Sakura Quest, and many more works.
She is very close to her younger brother and was once part of a doujinshi circle with him.