UPPER EAST ASAKUSA:

From Ginza, Hijiri will inform you that the Manikins are in Asakusa and suggest traveling through a tunnel in East Ikebukuro.

Head to East Ikebukuro and find the entrance to the Ikebukuro Tunnel.

Before entering, visit the Junk Shop to buy Light Balls and Float Balls, as the tunnel is dark and has damaging trap floors.

Enter the Ikebukuro Tunnel. The initial section is safe, but enemies will appear from B2 onwards.

The tunnel is dark, significantly reducing visibility on the Auto Map. Use Light Balls to illuminate the path.

A spirit near the tunnel entrance will suggest purchasing items for light.

Head into the tunnel to the left of the spirit and use a Light Ball. You'll encounter an Oni who warns of four powerful Onis within the tunnel.

To the left of this Oni, you can find a Save Room with an Amala Link, allowing you to return to previous areas and resupply.

To proceed towards Asakusa without fully exploring the tunnel (which is recommended for later), follow this path: From the B2 Save Terminal, head left and down to B3. On B3, go straight, right, then straight to a ladder to B4. On B4, go straight, left, straight, then right to a ladder back to B3. In B3 again, take a U-shaped path to another ladder to B2.

Back on B2, head down (or take the path to the one-way Save Terminal), then right. Follow the path to Kuramae Station.

Exit Kuramae Station into the Vortex World. Asakusa will be to the north.

Upon entering Asakusa, you'll find a Save Terminal, Cathedral of Shadows, Junk Shop, and Fountain of Life nearby.

If you have met the conditions (Maniax/Chronicle version, completed First and Second Kalpas, approached the Four Horsemen), the Menorah of Sovereignty will react, and you will trigger a boss fight with the White Rider near the Save Terminal.