What do you mean?

I was furious at Mr. Husband this morning. “Why do you never read anything that I recommend?”

“I do but they are super boring.” He tried to defend himself.

“Really? Ok, so what did you try recently?” seething I asked.

“That Naagin Book.”
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Any idea what book he was talking about?
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‘IKIGAI’
Do you know what is the relation between Naagin and Ikigai?
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If you know, enlighten me as well, I have no idea how these two are related.