Get off the Asakusabashi station for the subway (Asakusa Line) or train (JR Sobu Line).
Following the train tracks, go down the street to the AM/PM convenience store. This store's name is written in English. There are some streets between the station and AM/PM but I don't remember how many. At AM/PM turn right and go straight to the next AM/PM convenience store. Again, you will cross several streets but I don't remember how many.
Turn left at the AM/PM and go one block. You will walk by a school. Turn right and just a few yards down is another street. Turn left. Totoco is on this street on the right hand side. It is less than a block down.
When you go, please tell the owners Darla Tanaka said hello!