Cordial Chords

Cordial Chords (コーディアル・コード) is an extra story written by the author of the Sword Art Online light novel series, Kawahara Reki. It was released with the Japanese Limited Edition Blu-Rays and DVDs of Ordinal Scale, and is a sequel to the events of Hopeful Chant and Ordinal Scale.

Prologue
On May 7, 2026, Kirigaya Kazuto and Yuuki Asuna were spending their lunch break in a difficult-to-reach green zone their school's campus. With his girlfriend sleeping on his lap, the boy gently caressed her hair as he contemplated on how the sensation of hair, among other things, was handled in games. Having suddenly awoken in the midst of his musings and discovered where she was lying, Asuna attempted to rise to her feet due to feeling embarrassed. However, she was stopped by Kazuto, who urged her to sleep a little longer, arguing that they still had twenty minutes of their break left, while Doctor Kurahashi had stated that sleep would accelerate her recovery from the memory scan conducted on her. Despite showing some resistance, the girl once again lay her head on Kazuto's lap, before returning to sleep.

Part 1
While reminiscing the recent events, Kazuto made a comparison between the Augma technology and other FullDive machines. He noted that the newer device, in spite of being built with top-quality materials, could only send basic visual, aural and physical signals into the brain, contrary to the AmuSphere which had the capability to fully support all five senses.

Additionally, the boy was surprised that the Ordinal Scale game had been operating on old SAO server, as well as the revelation of the original Aincrad's hundredth floor boss's language engine being used on «White Yuna», who disappeared after the final battle.

Finally, Kazuto, while being unable to discard a feeling of anxiety inside him, remarked the unlikeliness of meeting still-in-a-detainment Nochizawa Eiji or YUNA, who was working as an AR idol.

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