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Miku Nakano's first pair of headphones resemble the Audio-Technica ATH-WS99BT's, which are real-life wireless headphones designed and manufactured by Audio-Technica Corporation. Although in the series, the two headphones have slightly modified ear cups and ear cup logos.
Her second headphones are identical to the Audio-Technica ATH-WS990BT's. The second pair of headphones are a replacement to her other similarly-branded headphones which stopped functioning due to the event in the near-end of the Seven Goodbyes Arc.
Negi Haruba received one pair from Audio-Technica.