Instrumental version of '深層マーメイド' (Romaji: Shinsou Mermaid) as heard on the event page. Featured in a new type of event called Platinum Star Twin Stage. Together with 961Pro's ZWEIGLANZ this event is called '深淵の蒼、熱焔の緋' (Shin'en no Sou, Netsu'en no Hi; Abyssal Blue and Scarlet Passion)
Full Playlist of the Event BGM's:
https://www.youtube.com/playlist?list=PLMIDElwvq4B2DgDjlfEHAAATtEuii_jv4
アイドルマスター（アイドルマスター ミリオンライブ！ シアターデイズ）の攻略動画
「ミリシタ」深層マーメイド (Event BGM) - Idolm@ster ML: Theater Days
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