AtD 293 Obscure languages

[robinlandseadel at comcast.net]

Any clue as to the language on the stamp/chop/seal on the cover?
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From: "Ya Sam" <takoitov at hotmail.com>

Tried to come up with the translation of the Japanese phrase, so basically 
Sumimasen - excuse me, sorry, Gonnusuringaa I couldn't find, and mottomo 
abunai - very dangerous, desu should be some grammatical element?