While they have sex, Lady J notices that Rain is more lively and motivated than usual, and after having sex, she finds out that it's because Rain saw how two of her peers, Mirei and Mamori, were close together.
Mamori Tokonome watches in astonishment as two girls show off their intimate relationship. Little did she know that she had to establish a similar relationship with another girl, Mirei Shikishima, in order to fight for her life.
Momoka unleashes an enormous Valkyrie Effect through Mamori, overpowering Mirei. Now that nobody on Mermaid is strong enough to oppose her now, Momoka reveals her true intentions.
Akira meets Lady Lady at their secret hideout, not to detain them, but to send them on a secret mission - to unearth the "secret of Mermaid", which could be the key to escaping the island.
Akira secretly leaves the castle to go on a secret mission. He meets Torino, and decides to spend the night outside of the castle. Meanwhile, a hostage situation takes place nearby.
A mysterious new transfer named Momoka arrives on Mermaid. She immediately begins to befriend Charlotte and undermine the political stability established by Akira.