Me suspects these are just rips from the CM and the ending.
If it was just a ring tone, then chances are that it was just for mobile phone browsers and not for a computer browser. Keep in mind that Japanese phones do have a 'Net service in a majority of their service plans and phone browsers designed for specifically for taking advantage of the 'Net via a phone. Also, keep in mind that some of these offers are for Japanese customers, not everybody else, which means you'll probably need an account with the service provider (like DoComo) in order to take advantage of it.