Abandoned outside an orphanage when he was just a baby, Yuki is a boy with no idea where he came from or who he really is. Now in high school, the teen is plagued by odd dreams, death threats and an ability to see the negativity that dwells within people's hearts. One night after being lured into a trap, a mysterious and handsome man named Zess saves Yuki from being killed before disappearing into the night. Then, with the sudden arrival of his long-lost brother, the orphan finds himself pulled into a new world where he can not only learn about his powers and how to control them, but also becomes aware of the evils that lurk in the darkness. Can Yuki finally find the place he truly belongs, and just why is Zess so protective over the young boy?
In world where flesh-eating monsters roam the streets, only one organization has the means to save civilization from annihilation: Red Shield, a specially-organized unit designed to fight these monsters, and the only weapon that can destroy them: Saya. Awakened from a 30-year sleep, Saya is thrust into a modern world which she has no memories of, and is troubled by a past filled only with bloodshed and sadness. With the undying love and support of her family and friends, she struggles to gain the strength to move forward and regain the pieces of her shattered memories.
The stories are remotely similar to each other but used in different contexts.
Both Saya and Yuki have forgotten their past and are being forced to fight. Main characters in both anime had a clsoe friend on their side in their past lives. Luka and Haji also have similar personalities and share the same devotion to the main characters. Uragiri wa Boku no Namae o Shitteiru is, however, much lighter than Blood +.
The Holy Grail War is a battle between seven magicians who each summon a mythical hero to fight for their cause. Shirou, a twice orphaned high school boy, had so little magical talent that his foster father did not bother teaching him about the war and its meaning. Thanks to that lack of foresight, Shirou finds himself in a bit of a pinch when he accidentally summons a hero of the strongest class, and is sucked into the fray. The Grail grants the winner any wish they have. But driven by an unyielding sense of justice and self-sacrifice, for what will Shirou fight?
Ritsuka has nowhere to run or hide. He lost his memories and his mother’s loving support, and then his brother -- his sole defender -- was brutally murdered. He is entirely alone until Soubi appears, saying the words he most wants to hear, but refuses to believe: “I love you and will do anything for you.” Flung into a world of intrigue and magic, where bonded pairs battle and only Soubi can fight for him, he struggles to find his brother’s killer. Yet he must also face the most bitter question of all: if you can't remember who you were, does that mean you don't know who you are?
If You enjoy watching Uragiri wa Boku, You for sure would like to check out Loveless! Both are story of troubled young boy with one day meets strange people with assert that he’s irreplaceable in some sort of fight. In both cases fight will be emotionally damaging for boy. Yuki (Uragiri wa Boku) will be forced to defeat his best friend, when Ritsuka (Loveless) will contemplate painful lost of his beloved brother. Also both series are Shounen-ai and have similar flavor.
For the young women at the Lillian private school for girls, nothing is more prestigious than Rosa Sinensis, Rosa Gigantea, and Rosa Foetida, the beautiful and talented women who head the student council. When a young girl named Yumi's path is intertwined with Sachiko, a successor to the council, things will never be the same for the both of them. Maria-sama ga Miteru is a quiet tale of forbidden romance, friendship, and the everyday life of a school girl.
Each of these series focus on rather bishonen characters developing non-customary relationships. In Maria, the characters work on developing relationships with their "sisters" while the relationships in Uragiri focus on people with similar souls. Although Uragiri is more fantasy based, I think that brings each series together. They are both also slow paced with similar art styles and a similar feel between the characters.