XAI (サイ, real name Aika Sai Sai) (崔愛花, is a Sai Aika)Japanese singer-songwriter. Winner of the Artist Prize at Toho's 8th Cinderella Audition, she performed the theme songs for all three entries in the GODZILLA anime trilogy.
- GODZILLA: Planet of the Monsters (2017) - Theme song ["WHITE OUT"]
- GODZILLA: City on the Edge of Battle (2018) - Theme song ["THE SKY FALLS"]
- GODZILLA: The Planet Eater (2018) - Theme song, lyrics ["live and die" and "Evergreen"]
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