Japan has many different convenience stores, the major ones being Lawson, 7-Eleven, Circle K, and Family Mart. The stores are usually open 24 hours a day, 7 days a week with no holidays. Multiple stores usually exist in one area and you shouldn't have to walk very far to find one no matter where you are.

Convenience stores can be compared to the American gas station and offer a wide range of daily necessities. The food selection includes snacks like chips or cookies, pre-made lunches like sushi and noodle dishes, and instant meals like ramen. Stores also sell drinks like soda, coffee, and alcohol. Some of the lunches can be heated for free by staff or by the customer themselves. Other products include magazines, umbrellas, health and beauty aids, batteries, and other small daily items.

Many stores offer other services like copy machines, ATMs, and ticket reservation machines. Note that 7-Eleven is one of the only convenience stores with an ATM that will accept international credit and debit cards. 7-Eleven can also serve as a drop off point for packages. It is even possible to ship large luggage via 7-Eleven. Be warned, though, that the stores only serve as drop off or pick up points for third party delivery services. So you'll need to have the delivery form from your chosen service filled out and attached to your package.

If you're looking for a toilet or a garbage bin (these are surprisingly hard to find in Japan) then most convenince stores will have these as well.