[amatsunagi]

Spoiler:

Basically gods policy are non-interference with the lower realm, unless there is problem caused by one of their kind (e.g. golden monkey). Sometimes they helped a little bit by way of oracle or gift but mostly they would leave things by itself. If the lower realm is deemed to be close to it's demise, then the action that they take is let the god of destruction erase the lower realm and restart a new cycle of world.

In current cycle, grandpa is doting on Touya, like his own grandson, therefore helps him a lot although indirectly as that the best he can do.