Kaf (花譜, stylized as KAF) is a Japanese singer-songwriter and virtual YouTuber represented by Kamitsubaki Studio. She is active on YouTube where she uploads original songs as well as covers of J-Pop and Vocaloid songs.

Kaf's avatar was created by the character designer Palow, who continues to oversee updates to her costumes and new designs. For her first 3 albums she worked with Vocaloid Producer Iori Kanzaki as the primary composer. In 2021 she started a side project to her solo work entitled "Suite" in which she would work with artists across various genres. In 2022 she became the first VTuber to perform at the Nippon Budokan.

She is also a member of the virtual singer group V.W.P -Virtual Witch Phenomenon- alongside other members of the Kamitsubaki Studio label, Phenomenon Record. She provided the voice model for CeVIO AI Song's voicebank KAFU, released in July 2021.