Make obento (lunchbox) for kids and Dad.
Hang futons to air out.
Do laundry (which may involve hauling water from the bathtub to the washing machine to save money).
Grocery shopping (practically daily because of the small size of many refrigerators and because many perishable foods are sold at the peak of their freshness, so they go bad quickly).
Take an English class.
Watch a soap opera, do the banking and cleaning, get dinner ready.
Do dishes by hand (not many places have room for a dishwasher).
Put out the futons at night.
Soak in the bathtub for 20-30 minutes (before or after Dad and the kids).
Help kids with homework. Deal with any letters from teachers (about events or PTA, not just bad kids). Plan to attend undokai (sports day events) for the kiddies at school (or open campus).
Give Dad his allowance. Feel happy that he actually made it home, even though it may be after a long day, followed by a night out drinking with the staff or clients. Have dinner for him no matter how late it is.
Save your "egg money" in order to make trips with girlfriends around the country or abroad once every couple of years.
Deal with most of the household bills and banking.
Often not even know what your husband does for a living, just that he brings home the bacon.
Deal with buying presents for weddings or birthdays or graduation (or preparing money for funerals or weddings).
Typical foods for breakfast may be grilled fish, rice, and miso soup or some pickled veggies and tea. Could also be fried eggs, toast, and sausage/bacon.
Lunch is usually light. Maybe Mr. Donut or a rice ball (onigiri) or leftovers.
Dinner could be anything. Spaghetti, udon, okonomiyaki, fried squid rings, yakisoba, "hamburg" patty, salad (lettuce or daikon), teppanyaki, donburi (beef, pork, chicken, vegetable, shrimp, or eel), fried chicken (karaage), more miso soup, more grilled fish, tofu, etc.