After a rash of disappearances, the Venus Vanguard investigates rumors of a strange, dark presence. Lucia will need Sumire's help to defeat the threat.
Sumire's weary of the testing meant to help her control her Berserker tendencies and longs for a normal life. Of course, it's hard to be normal when even a day at school could result in a battle with a Virus.
When her brother's personality changes in disturbing ways, a young girl seeks the help of the Venus Vanguard. Sumire and Lucia think a Virus could be at the root of the problem.
Lucia is hesitant to celebrate her birthday, which falls on the same day as Sumire's. Eventually, she warms to the idea and the birthday girls team up to make a cake.
Sumire thinks the world of Yoshiki, and they're growing closer with each passing day. Lucia isn't nearly as fond of Yoshiki and can't help but think he's got dubious intentions.