Getting to Yomotsu Hirasaka require you first beat Magatsu Inaba and Ameno Sagiri. On the final day, you'll want to take these steps: 1. Speak with all your social links and choose to stay in Inaba. 2. Go call a meeting at the Junes, and you'll get a letter. 3. Talk to Dojima at the Samegawa Flood Plain, and then enter the Velvet Room in the Shopping District. 4. Get the Orb of Sight from Igor and talk to the Gas Station Attendant, who will reveal themselves as 5. 5. Izanami, and you've unlocked the final dungeon.