Most of japanese home don't have an oven included in a kitchen stove as we european and american know it.
The average japanese kitchen usually have a cooktop with a fish grill included like this ( yeah, grilled fish is a serious matter )
so, an eletric oven ( like the one she used for the pie or for the pizza with sausage and pinapple) is a nice extra for cooking but they totally can live without if they eat traditional japanese meal ( i.e., mostly rice, soup, and fish....and fried food because hey, let's eat something tasty and greasy like fried chicken once in a while)
and lastly, convection oven microwave combo are a thing.