The Noise Canceler (ノイズキャンセラー Noizu Kyanserā) is an add-on for the Idea Engine made by Kokonoe Mercury. It cancels out the effect of Celica Ayatsuki Mercury’s ability to neutralize the activity of the magic element.

Noise Canceler is installed in Ragna’s left arm, so he can activate the Blue Grimoire even when Celica is nearby.

The canceler would not work properly without gathering data, so Kokonoe lied that she installed a Multi-Dimension Bomb in Ragna’s hand that would detonate when he gets separated from Celica.

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