This is a re-telling of the first series. one episode is seen through the view of Momiji, the other is seen through the view of Kusanagi.
 
(Source: Anime News Network)

Extra bits meant to add to the Blue Seed story. 
Episodes 1-13 are extras shown on the video releases of Blue Seed in Japan. They take place after every other episode, such as Omake 1 follows episode 2. 
Episode 14 is an extra featured with OVA Blue Seed 1.5.

Momiji is an average girl until the day she finds she is the descendant of the great Kushinada family. Only she, with her Kushinada blood, can stop the Aragami, demonic plant-like monsters threatening to destroy Japan. Along to help her is the TAC, and a possible love interest in a young man named Kusanagi.
 
(Source: Anime News Network)

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