第 6 集: Souta的White Day蛋糕變成Negatone，引發Hibiki的新武器

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When Souta decides to make something for Kanade for White Day, Hibiki agrees to help him out in making a cake. However, Kanade yells at Souta for making a mess in the kitchen, causing him to become upset and run off, where he is trapped after Siren makes a Negatone out of his cake. As Kanade fights to reach Souta, Hibiki's desire to protect their sibling bonds grants her a new weapon. Afterwards, Kanade apologises to Souta and accepts the gift, only to find it is filled with wasabi. (Source: Wikipedia)