Hanako Oku (? ?? Oku Hanako?, born March 20, 1978 in Funabashi, Chiba, Japan) is a J-Pop singer famous in her native Japan for her piano ballads. She rose to fame after performing the end-title track for the Madhouse film The Girl Who Leapt Through Time in 2006. She was signed to a major record label the preceding year.

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