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Chisato lives an ordinary life with her younger husband. Lately, her life has become monotonous and she has not had sex in a while, which makes her sexually frustrated. Then, one day, her husband's best friend, Hiroshi, comes to visit and her life changes. Hiroshi becomes aroused by Chisato and rapes her. Chisato is raped, but she is still sexually frustrated and becomes absorbed in a world of lust with Hiroshi.