Kyonyû OL to binyû hitozuma: Kita e mukau onna-tachi
Ai, an office lady, is raped by her boss, Hase, at a New Year's party at work. Hase's wife, Hinako, mistakenly believes Ai to be her husband's lover and goes to her apartment with a knife, but accidentally stabs Ai's live-in partner.
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Source 3
