Drag-On Dragoon Story Side is a novelization of the first Drakengard. It seems to follow a branch similar to branch A.
[Taken from Drakengard Wiki]
Drakengard: Story Side has finished publishing and it has 5 Chapters. It is also Known as: ドラッグオンドラグーン ストーリーサイド, DOD1: Story Side
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