Valkyrie Drive: Mermaid

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. ▽ I’m Getting Deflowered [Int'l: renamed English title] ▽ I'm Gonna Burst [Japan: literal English translation] ▽ Watashi, chirasa remasu [Japan: original Romaji title]

Mamori and Mirei defeat Saejima, but are taken into custody by Charlotte and Ange. Now Mamori must prepare for a mysterious ceremony known as the Wedding. ▽ Virgin Road [Japan: literal English translation / Int'l: English title] ▽ Vaajin roodo [Japan: original Romaji title] 《NOTE: "Virgin Road" is what the Japanese call a "Wedding Ceremony Aisle", specifically the highly-romantic chapel type popularized by mainstream films.》

Mamori and Mirei escape from the clutches of Welter. They soon learn the nature of the militant female-only group, and also discover a small peaceful village that is free from its rule. ▽ Zero Arm [Japan: literal English translation / Int'l: English title] ▽ Zero • aamu [Japan: original Romaji title]

Charlotte, Kasumi, and the forces of Wärter move in to take Mirei into custody, but the mysterious duo known as Lady Lady intervene. An all-out fight is about to break loose, but is halted by yet another new participant. ▽ Gouverneur [Japan: literal English translation / Int'l: English title] ▽ Guverunea [Japan: original Romaji title] 《NOTE: "Gouverneur" is the French word meaning "Governor".》

Kasumi leaves the castle to investigate a strange Extar reading in the forest. There, she finds Mamori, Mirei, and a truly, tremendously buxom girl.

The Mermaid Festival is here! Meifeng must control the outcome of the Beauty Pageant to cash in on her illegal gambling scam, and she knows just the right person for shaking up the votes.

Akira 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.

Lady Lady are asked by Akira to investigate a location said to contain the secret of Mermaid, bringing Mamori, Mirei, and Meifon along with them. Uncovering a hidden cave, the girls find an underground construction plant, where they are attacked by an Artificial Arm that Mirei finds all too familiar. Unable to drive with Mamori following the ordeal of her attack, Mirei unleashes the true ability hidden in her body to fight the Arm, but is still overpowered by it. However, Mamori, determined to protect Mirei, brings out enhanced abilities of her own and transforms into an enhanced arm, allowing Mirei to defeat the Arm. As the girls manage to escape the facility as it is destroyed, another island, having detected the Valkyrie Effect coming from the battle, sends a girl named Momoka Sagara to Mermaid to investigate.

Momoka arrives on Mermaid under the guise of a new transfer, quickly demonstrating her Exter abilities and becoming a part of Charlotte's Adel team. Quickly deducing Akira's true gender, Momoka manipulates Charlotte into confronting Akira in a battle in order to expose the truth. Noticing something about Momoka's power, Akira brings out the full strength of her Artificial Arm, Sri, against Charlotte and Momoka and manages to defeat them. However, Momoka brings out her true power as a third generation Artificial Arm, overpowering Akira and exposing her gender to everyone and encouraging Charlotte to become Mermaid's new leader, after which Mamori and Mirei discover Atelier Torino in shambles.