Final Fantasy VII - Crisis Core: Turks & Mako Reactor:

Turks & Mako Reactor

Shinra's HQ's getting attacked by Genesis, meeting Turks (where's the blondie Turk ;_;). Then, Seph calls you to clean a mako reactor (the Part 3 is showing a bloody good amv), where you'll find Hollander, Genesis, and Angeal.
Then you fall to a well known church garden.

Part 1:

Part 2:

Part 3:

Part 4:

Part 5:

Part 6:

Part 7: