ChäoS;Child takes place in October 2015, six years after the events of ChäoS;HEAd. Abnormal events begin to occur in Shibuya district, including mysterious deaths.
The final battle takes place in the Hikariwo theater, where Takuru is trapped in a sightless and soundless prison in his own mind. He'll need Onoe's help to break free, but after what he knows about her, can he bring himself to ask for it?