FictionJunction (フィクションジャンクション) is Japanese composer Yuki Kajiura’s solo project. It is not a pseudonym that Kajiura uses when she composes soundtracks. To date, all such collaborations have consisted of a (female) vocalists, aka Utahime, with Kajiura on the keyboard or the piano.

Current Utahime:

KAORI (also has solo works)

KEIKO

WAKANA

YURIKO KAIDA (Also has solo works as KAiiDA)

YUUKA (solo work as Yuuka Nanri)

Other Utahime (currently not performed as "FictionJunction"):

ASUKA (performed only in "Everlasting Song". Currently Aira Yuuki)

KEIKO and WAKANA are also part of Kalafina with Hikaru.

KAORI is also part of Sound Horizon.