If you're looking for anime similar to Orris Root no Gin no Koeda, you might like these titles.
From his heavenly perch, God distributes girl and boy hearts to babies about to be born. But a prank by the mischievous angel Tink leaves Princess Sapphire of Silverland with both a male and female heart! Due to an old-fashioned law preventing a woman from ruling, Sapphire must disguise herself as a prince to prevent the scheming Duke Duralumin from coming to power. The plan goes fairly well until a fencing tournament goes awry and the girl is stripped of her royal title. Now, in order to get her old life back, Sapphire must escape from jail, battle dragons, and even get transformed into a swan! Can the girl brawl and charm her way to true happiness?
Magic and spells are superstitious and silly -- or at least, that's what Ayu used to think. The popular high schooler's life used to be filled with classwork and daydreams of Kaji, until Nina became involved in her life! Hailing from the Magic Kingdom, the witch apprentice is eager to help Ayu through any situation, including the inevitable loss of a tennis match against a rival she can't defeat: a boy! Luckily, to help her win, Nina devises a spell to turn her into something more appropriate: a male?! With time running out, can Ayu win the match and Kaji, even though she's no longer a she?
Tiny schoolgirl Chiiko develops a crush on older boy Saly and believes herself to be his girlfriend, although Saly is already involved in a love triangle with a girl called Tonko.
Nina was just a normal twelve-year-old girl - until she ate a strange candy-like jewel that fell out of the sky into her sundae. The jewel, it seems, is known as the Crystal Pearl, and it is sought after by hordes of magic users who aspire to become professional magicians. Whoever is in the possession of the Pearl on Christmas will pass the test; leaving Nina as the most sought after item of the magic world. Luckily for her, two handsome magicians, Ichii and Zero, have pledged to keep her safe until the contest has ended. Can Nina keep her sanity with not only dozens of magicians out to capture her, but also the invasion of these two hunks into every aspect of her life?
Six months have passed since Rayne, Hyuga, Angelique and Jade were betrayed by Nyx and watched both him and their mansion burn to the ground. Arcadia is now in ruin, Thanatos is growing stronger, and the Aube Hunters - who have been missing for some time - are now seen as scapegoats for the destruction of the land. With time running out, Arcadia's only hope lies with the now-scorned Aube Hunters and Angelique, the only person capable of saving the land from darkness...
Jack has moved to Hokkaidou to get treatment for an illness, but he's lonely and unhappy. One night a man on a horse rides through his window to help him. For a reason he doesn't understand, Jack instantly knows the man's name and feels they've met somewhere before. The man, Cu Chulainn, tells Jack to open the moonlight shadow window, which leads him to Nymphidia, the world of Midsummer Night's Dream, whose inhabitants are waiting for a new Fairy King.