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The Venus Vanguard gets a request from a new client about a strange shadow that may be the cause of some recent disappearances. When Lucia and Sumire try to fight it, Lucia soon discovers that she will need Sumire's help more than she thought.

While tests are performed to help Sumire control her Berserker power, she begins to wish that her life was back to normal. When confronted by a Virus at school, she has no choice but to find some way to defeat it.

A young girl come to the Venus Vanguard to request help after her brother starts acting cold toward her. Suspecting the cause being a Virus, Lucia and Sumire go to her house to investigate.

The story of when Sumire first met Lucia is explained. Once being told everything by Lucia, Sumire ends up joining the Venus Vanguard to help to exterminate them.

A new enemy named Luca appears, and she is different than a typical Virus; for one, the anti-virus bullets are not affective on her. Luca attacks Yoshiki at the park, which causes Sumire to turn the gun on herself to unleash Berserker.

Guy, a new foe stronger than Luca appears and Lucia tries to stop him, but gets severely injured in the process. Later, Lucia tries again, but is losing until Sumire comes to help.

As Lucia recovers from her fight with Guy, Nahashi reminisces about the past. The story begins eighteen years ago when Nahashi was with Lucia's parents before she was born.

Lucia starts to act cold towards Sumire and acts on her own, going after Guy, but is caught in a trap when Luca interferes.

Sumire's and Lucia's birthday, both on July 7, is coming up, and at first Lucia does not want to celebrate her birthday. Lucia ultimately gives in and starts learning with Sumire on how to bake a cake. Meanwhile, Sumire's and Yoshiki's relationship develops further.

Yoshiki and Sumire start to hang out more together, and Sumire believes him to be a very kind person. However, Lucia believes he has an ulterior motive.

Yoshiki disappears and Sumire tries to search for him alone, but is initially unsuccessful. Nahashi and Laura come back and they leave with Lucia to try and find Sumire before Lucif gets to her

After a short fight between Lucia and her father Lucif, Lucia initially concedes defeat when she is told she will be able to see her mother. However, the power of her eye shows her the truth behind what happened in the past and Lucia vows to destroy her father.