Another one that would marry and fuck old rich guys!
I can imagine Miri Ichika one day outside jogging in the forest or in a park. She then sits down to take a rest right next to this old guy by the pond. They get to talking and she feels sorry for this guy because he lost his beloved wife ten years ago and his kids are vultures wanting to inherit his wealth and his beautiful mansion.
So they agreed to a pact Miri Ichika inherits his wealth and his mansion. She carries and raises his new children.