As AKATSUKI members arrive in Okinawa for the Qualifying Rounds of SS, they find themselves surrounded by local idols. RYUSEITAI, too, is caught up in the chaos. Constrained by the "order" they've been given, everyone's trying hard to find solutions and escape the predicament.
Submarine (サブマリン, sabumarin) is an event story released on May 31st 2021. It is unlocked permanently during SS/2nd Stage: Submarine event.
Prologue Ugh... I-I get it, and I'll try, so stop shaking me.
Battleground: Okinawa - 3 You can run, but you can't escape! As long as RYUSEITAI is here, evil will never triumph in this world!
Paradise Beyond the Sea - 6 ......
Paradise Beyond the Sea - 13 The Esoterica of Kanzaki Family—the Dance of the Deicide...!
Epilogue - 2 Those who let their guard down are the first to die on the battlefield.
Epilogue - 3 (I'll never forget that day when you all rushed over to help me clean up as if that was the most natural thing in the world. I really appreciated it.)
Epilogue - 5 So, let us dance, Sir Shinkai. Let's sing with joy in our hearts.
Epilogue - 5 It's such a pleasure to merely look at you... My favorite, good kid~♪