On the night of full moon in the demonic shadow of Edo, the summoner Raidou fought through a cadre of beasts made wild and furious by the silver orb above for the single purpose of capturing the maiden who manipulated them.

He stood at the end, the victor, the maiden moved by his fury with blade and gun, and his determination to challenger her at the time when she was strongest.

Leanan Sidehe is a being with great mental powers, and she turns those powers to healing Raidou when he is wounded, her powers combined with Raidou's allow the summoner to use a frost blast from his pistol to stop foes cold.

(looking back on this I think I should write for walkthrough guides.)