The lawyer who collaborates with Ayako to buy out Naoyuki. He actively schemes to frame Yuki, fabricating circumstances to make her pregnant child seem like evidence of adultery, which ultimately drives her to suicide.
They cooperate financially and strategically against the existing household arrangement.
Ayako and Tateoka collaborate to buy out the husband and are associated with the scheme against Yuki.
Tateoka becomes an active opponent whose scheme traps Yuki.
Tateoka contrives a scheme that makes Yuki's pregnancy appear to be evidence of adultery, contributing directly to her tragic end.
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