One scene in the manga suggests that Kohina comes from a violent household with it's members often fighting, forcing Kohina to shut her ears and become the emotionally-attached "doll" that she claims to be.

Kohina's Past Life

Kohina's Past Life

Kohina actually met Kokkuri-san in her past life, however she did not have any recollection of this. Kokkuri-san haunted her only to fulfill the promise he made with Kohina's past self which was to make her smile everyday.

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