Also known as: 謎のアイドルXオルタ, 謎のアイドルX〔オルタ〕
A version of Mysterious Heroine X Alter (Fate) transformed by Miss Crane (Fate) into a Foreigner-class Servant during the Kagayake! Grail Live!! event. Uses her guitar and various references to rhythm games to fight. Her Noble Phantasm is Luminous Calibur.
Her laid-back nature, guitar and idol outfit resemble Aoba Moca from BanG Dream!, oddly enough.
Character Design: BUNBUN
Voice Actress: Kawasumi Ayako
