No Koto Otomari Dakara: Shinseki

Situation 1 – Avoiding Gossip

A: "I heard your uncle had a big argument at the family reunion."
B: "Shinseki no koto otomari dakara."
(That’s family business – stop there.)

Situation 2 – Protecting Privacy

A tries to invite a distant cousin to a private event.
B: "Shinseki no koto otomari dakara."
(Don’t involve relatives in this – stop.)

Situation 3 – Teaching Japanese

A learner asks: "Can I use this phrase in Tokyo?"
Answer: No – it sounds unnatural. Use instead:
"Shinseki no koto na node, yamete kudasai." (More natural standard Japanese.)

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"shinseki no koto otomari dakara" appears to be a romanization of Japanese; a likely natural rendering is 「親戚のことでお泊まりだから」. That translates roughly to: "Because it's about relatives, (I'm) staying overnight" or "I'm staying over because of family/relatives." Possible conversational contexts:

In some Western Japanese dialects (e.g., Kansai-ben), sentence-ending particles and verb forms differ. To tell work/school politely:

It could be a gentle but firm boundary-setting phrase.