-( Story related, cannot be missed )-
This is a part of the main story plot and you WILL end up meeting this oaf more often than you'll want to later on. To start, try to leave Kamiki Village and you will encounter a merchant burdened by demons. After slaying them, you will be prompted to get Susano to fix the situation. When Amaterasu flings Susano onto her back and gives control back to you, you will earn this trophy.