She later registered with a matchmaking service, specifically asking to meet wealthy men with an annual income of more than ¥10 million ($87,900).
Sentenced to death by hanging for an old millionaire in Japan for the murders of three of his spouses and a murder attempt on a fourth.
The serial killer kept some of her cyanide in a plant pot which she later threw out, according to prosecutors.
Poison was found in the body of at least two men she was involved with, and police reportedly found traces of cyanide in rubbish at Kakchi's home.
She was also accused of killing two other boyfriends, aged between 70 and 80, as well as the attempted murder and robbery of another boyfriend, between 2007 and 2013.
The court underlined that Kakehi did not suffer dementia when she committed the last crime in December 2013. Kakehi's lawyers filed an appeal.
Like the venomous spider that kills its mate after copulation, 70-year-old Chisako Kakehi formed relationships with elderly men and then tricked them into drinking cyanide to collect the insurance money, reports Kyodo News.
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The court ruled that Chisako Kakehi is guilty in all four cases, which took place in three western prefectures.
But later that week, she backtracked, saying she did not remember admitting to the killing. But following his death in around 1994, the factory went bankrupt and her house was put up for auction, leading her to ask neighbors for a loan.
"Even if I were executed tomorrow, I would die smiling", Kakehi told judges.
She had earlier told judges she was ready to face the gallows. She married or was associated with more than 10 men and inherited about ¥1 billion, though she eventually fell into debt following dabbles into the stock market and futures trading.
The justice rejected the argument of his lawyers who contended that the accused was suffering from dementia and that therefore it could not be held criminally responsible.
The presiding judge, Ayako Nakagawa, stated that extenuating mental health issues could not explain away the extreme nature of her history, saying, "It was a heinous crime driven by greed for money". The 135-day trial was Japan's second-longest court case of its kind since 2009, when the nation instituted a judge-jury system.