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In page E-girls:

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On 3 October, E-girls were invited to perform at the Asia Song Festival 2018 in South Korea.[2] On the same day, they released their 6th digital single "Perfect World". The song was used as theme song for the movie Perfect World Kimi to Iru Kiseki, starring Sandaime J Soul Brothers/EXILE member Takanori Iwata.[citation needed]