When Meg and Amy accompany Sei to her grandfather's exclusive boat party, they're in for more than just a soiree. Following the announcement of Sei's arranged marriage to a member of the Black Lotus clan, the veil drops on years of old rivalries. And it's only a matter of time before things turn violent.

While Meg and Jo wash up on one of the Red Ocean's beaches, Sei is told by her Grandfather to follow her own path to happiness. Taking this opportunity for what it's worth, she devises a plan to destroy not only RAPT, but the dominance it has commanded over Tokyo. All she has to do is reassembling the team to do it.