Fight past the nezumi and the four-armed guardian to reach Lord Bishamonten. To make the guardian appear, you need 3 total people: 1 to go south and PUSH STATUE, 1 to go north and PUSH STATUE, and 1 to stay put and kill him. If someone leaves their statue, the guardian will re-freeze. This is a good way to pause the fight for healing.
Once the guardian is dead, you'll need to receive the blessing of the kami before you can move east into Bishamonten's castle. There are four shrines in japan; you must go to all four and BOW STATUE. You should get a blessing message at each statue. Once you have bowed to all four, you will receive a major blessing (shows up in your status). This blessing grants you -15ac and can be repeated at any time for the AC boost.
Once blessed, go to Bishamonten and ASK LORD TREASURE, then ASK LORD QUESTION.
Depending on his question, you will answer differently: