Fragile Dreams: Farewell Ruins of the Moon

Seto: A fifteen-year-old boy. After the old man he lives with passes away, Seto travels alone searching for survivors like himself somewhere in the world, with his only clue being in the letter the old man left him. While searching he finds a silver-haired girl sitting under the moon singing. He watchers her and takes a step on a squeaky shoe. She quickly turns her head saying, "who's there?" and falls. Seto runs to help her and puts his hand on her face. She opens her eyes and runs without a word and leaves. In the English version, he is voiced by Johnny Yong Bosch. In the Japanese version, he is voiced by Houko Kuwashima.
Silver-haired girl/Ren: A silver-haired girl whom Seto first encounters sitting on a lurching steel frame, singing beneath the moonlight. Walking in the ruins, playfully drawing large, cryptic drawing, looking for treasure, meeting with cats, she dreams of meeting another human. In the English version, she is voiced by Danielle Judovits. In the Japanese version, she is voiced by Miku Yoshikawa.
Sai: The bodiless consciousness of a young woman wandering the ruins. Despite her friendly acquaintanceship (and soon friendship) with Seto, she had a connection to Shin's past. She was used for experiments by Shin and his other peers, though he would often treat her with kindness and bring her small presents. She appears during the ending, telling Shin that she loves him, and they disappear together. In the English version, she is voiced by Karen Strassman. In the Japanese version, she is voiced by Ryo Hirohashi.
Crow: An amnesiac boy. However, he refuses to despair, remaining cheerful, mischievous and straightforward. In order to find his birthplace, relying only on a single photo, he continues traveling. Though he and Seto go on a rocky start, they soon become friends. He is voiced by Steve Staley in the English version and by Mie Sonozaki in the Japanese version.
Personal Frame: A portable computer that Seto carries on his back and helps guide him. Having been alone for a long time, waiting for someone to come, she was happy when Seto replied. She loves having conversations more than anything else, and has a duty to serve her master Seto to her fullest. The English voice is provided by Heather Halley. in the Japanese audio, she is voiced by Umeka Shōji.
Chiyo: The bodiless consciousness of a small girl. She is voiced by Laura Bailey in the English version and Chiwa Saito in the Japanese version.
The Merchant: A mysterious man who trades in various goods. Always merry, he appears before Seto. He collects lots of sparkling things. He is voiced by Dave Wittenberg in the English version and Tomohisa Aso in the Japanese version.
Shin: The antagonist and a "genius scientist" whose brilliance has earned him envy from his colleagues. He considers speech to be an inferior means of communication, and intends to wipe out the last remnants of humanity by means of a "project". He was snubbed by peers and family for his abilities, and was able to sense other's emotions. He would often visit Sai in his spare time and bring her presents. During the ending, she appears to him, telling him that she loves him. He wonders why he did not sense that emotion, thanks Seto, and vanishes together with Sai. He is voiced by Sam Regal in the English version and Toshio Furukawa in the Japanese version.[9][10]