i dong understand the plotline, what is all of this leading to ?

same （￣へ￣）

Some kind of conspiracy around the book of the dead plus why this human is all yin energy and attracting all this supernatural lust. I hope it gets clearer soon.
Right now the focus is on protecting the human from evil, which can't, umm...be done on an empty stomach; and alsoa...maybe wiping out the ghost and demon who want to possess the human as a bonus.
Meanwhile, the head goblin bangs the reaper/704 in exchange for creating yang vitamins for San

aaaah, thank you for clearing things up, its quite hard to follow

This is actually a super helpful and funny explaination thanks!