"Fighting KOS-MOS" plays during a scene that showcases KOS-MOS' power, but composer Yasunori Mitsuda chose to write the track from Shion's perspective for a twist.
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Shion makes an appearance in Namco × Capcom, when she, MOMO, and KOS-MOS appear in the middle of Shibuya during a series of dimensional disturbances, in time to help the main characters against a Gnosis attack.
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Shion's main theme in Episode I is the ending song "Kokoro"(heart) performed by Joanne Hogg.