18 Palace Plaza
Marunouchi, Tokyo 118-8336
The address does not work in Google maps (unless I'm doing something wrong).
The email address appears to be working, but there is no automatic reply like on the Slusho site.
The phone number works, and has a recorded message in English and Japanese:
Thank you for calling Tagruato. Due to high call volumes, your call has been transferred to an automated answering service. There are no updates at this time. After the tone, please leave a message, and one of our associates will find you as soon as possible.I recorded the call so you can hear the message for yourself:
Tagruato Message - English (64Kbps MP3, 125k)
Tagruato Message - Japanese (64Kbps MP3, 165k)
Dizzy has confirmed in the comments that the Japanese and English messages are the same.
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UPDATE: It looks like Marunouchi is some kind of business center. There is a map of all the buildings, but no Tagruato.