Chiaki

Chiaki took part in a carbon monoxide suicide party in the ghost village of Hinamizawa in late June of 2006. Her reasons for ending her life are unknown, but it is hinted to involve the death of her husband. The husband left Chiaki with huge amount of money that he had earned with the success of his business, and she intended to "bring it to him" once she was dead. Otobe Akira, who also took part in the suicide, intended to die due to his life of debt. However, he decided to keep his life, and steal Chiaki's cash card once everyone else was done passing around sleeping pills. Otobe later regreted his actions, and returned the money to her body. Then Chiaki's voice spoke to him from beyond the "Land of the Dead", and told him that she thinks he's okay to take her money, if it gives him the will to live again. Otobe refused, and accepted the hardships of his life, instead of cheating his way through it. Chiaki told him that she and the rest of the suicide party would have taken the same path if they had over come their struggles with everything they had, and she wished him good luck. (Source: Higurashi No Naku Koro Ni Wiki)