念願かなってDJの祭典「D4 FES.」に参加したMerm4id。水島茉莉花、日高さおり、松山ダリアはいつもと違う瀬戸リカを心配する。そんな中、ライブを終えた燐舞曲のもとに、リカがやってくる。
遇播放卡顿或无法播放时，可切换线路播放
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