Shuffle! Prologue is a short OVA teaser for the Shuffle! anime series based on the visual novel of the same name. While some of the animation was reused for the first episode of the anime series, most of Shuffle! Prologue is unique animation not repeated in the series, although the story itself is retold.

[Source: Wikipedia]

In present times, Gods and Demons coexist together with Humans after the door between each of these worlds had opened. Tsuchimi Rin is a normal young high school student attending Verbena Academy, spending his days living peacefully with his childhood friend Kaede. Unexpectedly, one day the King of Gods, the King of Demons and their families move into be Rin's next door neighbors. Apparently the daughter of the Gods, Sia, and the daughter of the demons, Nerine, are both deeply in love with Rin after having met him in the past. Along with his playful friendship with upperclassmen Asa and his encounter with the silent but cute Primula, Rin has much on his hands dealing with the affections of each of these girls. Based on the eroge by Navel.

A recap of the Shuffle world, set ten years in the future. Gods, Demons, and Humans freely visit the other worlds as if traveling overseas, and romance is in the air. Demons, Gods, And Humans together have been falling in love and creating new families, breaking down the wall that once seperated them. Past memories are visited by Rin Tsuchimi and the events that occured between him and Lisianthus, Nerine, Kaede, Asa, and Primula.

[Source: Anime News Network]