Shinki are just what the name says: we're a god's divine instrument. Other people have given good answers to your question, so I won't bother repeating them.
But for the record, you won't be able to draw a borderline or do any other abilities without a god-given name. Basically now you're a spirit, and those tend to end up as ayakashi food.
You might want to reconsider teaming up with a god.
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Shinki are just what the name says: we're a god's divine instrument. Other people have given good answers to your question, so I won't bother repeating them.
But for the record, you won't be able to draw a borderline or do any other abilities without a god-given name.
Basically now you're a spirit, and those tend to end up as ayakashi food.
You might want to reconsider teaming up with a god.