Machiko along with her husband Takashi take part in the death game of darts.

Spoiler

It is later found out that she was having an affair and carrying the baby of her boyfriend, which leads to Takashi trying to attack her with a dart. After Takashi passes out, Machiko re-enters one of the elevators which takes her to the void. However, in Onna's opinion, the baby she carries actually belongs to Takashi and she acted guilty because she truly loves the latter, where later on Decim realizing that he made a mistake but it was too late for any rectification.