I have an interest in Japan, and this is a decent overview for people who are looking for an introduction, but it had some inaccuraries--or some gaps. It mentioned Yomi and that this was the underworld where all souls went, but failed to mentioned ano ko or Toyoko, which is also where souls went. Saying souls went to Yomi prior to Buddhism and not touching on the other Shinto aspects of the afterlife (though it is true that Shinto does not dwell on the afterlife as much), doesn't do the lore justice.
There are better books on Japanese mythology. I ended up skimming it when I realized it wasn't going to tell me anything new.