This article argues that the famous ikigai Venn diagram is not the real meaning of ikigai.
https://ikigaitribe.com/ikigai/ikigai-misunderstood/
The Ten Rules of ikigai.
https://ikigaitribe.com/ikigai/the-10-rules-of-ikigai/
5 Pillars of ikigain by Ken Mogi
https://ikigaitribe.com/ikigai/the-5-pillars-of-ikigai/
Three books about ikigai.
https://ikigaitribe.com/ikigai-book-reviews/