Kotaki Kyodai to Shikuhakku S01E04 - 'The suffering of death'

The unemployed brothers, Ichiji (Kanji Furutachi) and Niji (Kenichi Takitō), are once again requested to 'rental father'! This request started with an interview with her client, Kanako Higuchi, saying that it would be a little long-term, but she says, 'The world will end in three months.' Ichiji feels distrustful of Sumiko, who treats her brother as if she were a slave, but she is overjoyed that she can make a lot of money. What is the true request of Sumiko, who has many mysteries?