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Hottaraka Series (Japanese: ほったらかシリーズ, "Irresponsible Series") is the debut extended play by Japanese band Chai, released on August 22, 2015. Originally a self-released album, it was later given a global digital release and a Japan-wide release in 2016. The extended play's leading promotional track "Gyaranboo" was a success in the United Kingdom, where it reached number 36 on Spotify's UK top 50 chart, without any promotion from the band.