Kyoko (キョウコ Kyōko?, 4): One of Satoru's ex-partners who went on an expedition with him years ago. While searching for a Precious, Satoru accidentally set off a trap which created a ring of fire that neither she nor Masaki could escape and Satoru could not reach them. Satoru swore to get help and rescue them, but the trap triggered an explosion, killing Kyoko and Masaki before Satoru could even leave to find help. Portrayed by Miki Handa (繁田 美貴 Handa Miki?).