Need help re: One-Day Open Ticket

Hi everyone, i refer to this page regarding the "One-Day Open Ticket"
http://www.tokyometro.jp/e/ticket/oneday.html

When they say "This ticket is good for unlimited use for one day, on Tokyo Metro lines only."

Does it mean that for within the period of the day that i bought the ticket, i will have unlimited use of the following lines on this webpage and for only the cost of 710 yen per day?
http://www.tokyometro.jp/rosen/rosenzu/pdf/rosen_eng.pdf

1. Ginza Line
2. Marunouchi Line
3. Hibiya Line
4. Tozai Line
5. Chiyoda Line
6. Yurakucho Line
7. Yurakucho Line (New Line)
8. Hanzomon Line
9. Namboku Line

Additionally, i would be arriving from Narita airport so since the pass stations are listed in japanese, would any kind soul kindly direct if i will be able to buy this ticket at Narita Airport or other nearest stations?

Sorry for the inconveniences and much thanks in advance

Yes. This pass is valid for 9 Metro lines. You can buy the pass at the ticket vending machine at any Metro stations on the same day. If you want to buy it in advance, you can get it at "Teikiken Uriba (commuter pass selling office)" at major Metro stations.