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Osada (長田) family name, Kazumi (一美) first name
1980s: Met Eikichi Osada when she was a magazine writer.
1985: Wrote for SM Hisyousetsu and SM Mania until 1990.
1995: An assistant of Eikichi Osada
2001: Given "Osada" name.
2001: Sep. Took over the Osada Seminar.
2016: Mar. 1st annual at bar Tied Up with Yoi Yoshida
- 『M女が語る 女性に好かれる縛り方("Rope Techniques by the M-jo for the M-jo")』(Osada Seminar, 2004)