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Megami Tensei, 2F, Square 3, 18
Kyuuyaku Megami Tensei, Megami Tensei
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Where
Megami Tensei, 2F, Square 3, 18
What they say
The door is locked!扉にはカギが掛かっている！
But you could use the Small Key to get in.が、「小さなカギ」を使って 中に入ることができた