Devil May Cry 4/Porte de L'Enfer

Opera House Exterior
The cutscene shows demons attacks citizens of the town in the plaza. Credo leads them to a gate and leaves Nero to kill the demons. There is not much in this area, just kill of the scarecrows and move on. Red orbs are contained in the benches, smash as many as possible. The door to the storeroom is at the end near the floating red orb. You will recieve a tutorial if they are turned on.

Storehouse
As soon as you enter this room there is an oppitunity to gain a precious gold orb. It is in a small hole in the wall at the top of the small steps. Just climb the wall to get it. After this climb the main stairs to the upper floor. In this room three scarecrows will ambush you and they must be killed to proceed. Red orbs are hidden inside all of the boxes and shelving units.

Business District, Terrace
Nothing to do here. There is a small army of scarecrows smashing uo the city below but there is nothing to do about this (for now anyway). Enter the Cathredral through the door on the left.

Catherdral
Head to the lower section of this building. Down there there are some chairs that can be smashed for red orbs and the Evil Legacy skull, granting the ability to use Snatch and Grim Grips. After picking this uo go up a floor. There is a Vitality Star S in one of the sections, snatch it with the devil bringer to pick it up. There is a green orb on the otherside if you need health. Follow the grim grips to the exit, being sure to smash all of the benches along the way. There is also a large red orb on the left at the exit, obtainable by snatching it. YOu can jump across to get it but then you fall back down to the bottom of the Cathedral.

Business District, Terrace
You can now grapple across the street to the other side. Over here is the entrance to the first secret mission Annilation.