Mayumi Thyme is a heterochromia-eyed girl in Rin's class who is always looking for news. She has the smallest bust size in the series, a fact often made fun of by Rin and Itsuki. Nonetheless, she takes pride in her small breasts, rationalizing that by being below average they are a rarity sought after by a select group of men.  Mayumi is a half demon, that's the reason for the color of her eyes. though she doesn't have the other signs of demons, such as long ears and magical powers.

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 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.

[Wiki (jp)](https://ja.wikipedia.org/wiki/井上美紀)

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)

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)

Anime description from Froth-Bite: 
The world as we know it was suddenly altered forever when the door for the dimension of the gods and the door of the dimension of the demons suddenly opened up. Ten years later, a boy named Tsuchimi Rin was entrusted with two princesses from those dimensions. Will he be able to keep his sanity while living with his childhood friend Kaede, trying to live a normal school life, and also being a neighbor to both of princesses and their fathers, the mighty dimension Lords? The hearts of those girls are at stake and only Rin has the key to unlock them.

Rin, Nerine, Mayumi and Itsuki travel back in time where they meet Nerine's parents before they got together. But Nerine has started to change, has their interference changed history? Follow Rin &amp; Co. as they try to set history back to normal!

Kaede loses her memory so Rin and friends must help her recover them! Phoenix Wright style! Rin and Kaede's childhood friend, Sakura returns and a new love triangle begins.
