Q: Please advice that I need Winter Tires or not.

Whether you need Winter Tires or not must be judged by yourself on your own responsibility.

Under Japanese traffic law, you must have Winter Tires to drive on snowy/icy roads.

In the case your car renal company judges your rental is not safe, they have the right to cancel your reservation upon arrival.

Even in this case, the cancellation charge is incurred and the paid ToCoo! option fee is NOT refunded.