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1- Blood+ ( must watch )
In a village many years ago, there was an incursion of monsters and a girl with a sword who killed everything around her: monsters, villagers, and the military, all while she has a crazed look in her eyes. In the present, there is a girl named Otonashi Saya who seems to be a normal high school student, except that she has no memories of more than a year ago. After a trip to the hospital with her foster brother Kai, Saya returns home alone and sees a small crowd around a man playing a cello. The music gives her a strange vision of a girl running in a large castle-like building. This girl takes out a key and reaches to open a lock. Saya tries to call out to stop the girl in her vision, but trips into some bushes, attracting the attention of the crowd in front of her. She runs off embarrassed and returns home to find her foster father George and little brother Riku playing catch. At family restaurant, Saya discovers that she’s left her track shoes at school. As she’s heading out the door, she runs into David, a man who has business with her father. After Saya leaves, the two men discuss her, with George refusing to hand her over and David labels her as George’s replacement daughter. David leaves an envelope of money that he calls this month’s share before he walks out. Sneaking into school, Saya runs into the cellist from before, Hagi, who pulls out a dagger. This frightens Saya enough to run the other way, bumping into one of the teachers. He searches the grounds where she was but can’t find anyone. As he passes under a tree walking towards her, a giant arm appears and pulls him up. Various squishy noises later, his limp and bloodied body falls down. A large monster soon follows, prompting Saya to run. At home, Saya’s friend Kaori comes by with Saya’s shoes, so George calls Kai to go check up on his sister. Saya gets injured by her pursuer and seems to have no where to run when she spots the cellist again. He throws a dagger that takes out the monster’s eye, but Saya gets knocked unconscious by the subsequent flailing. Hagi takes her body and runs to a science lab. He tells her that the monsters are called Yokushu, beasts that drink the lifeblood of others. While talking, he takes a sword out of his cello case, unravels his demonic looking hand, and cuts it. When Saya refuses his outstretched bloody hand, Hagi drinks his own blood and then tackles Saya out of the way when the Yokushu jumps for her. Kai has arrived at school by now and follows the bloody floor to the same room. He comes in to see Hagi kissing Saya and depositing his blood into her mouth. Hagi then tells her to fight, evoking in her memories of that night many years ago and of the girl opening the padlocked door. Saya’s eyes dilate red.
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2- claymore ( must watch )
Based on the shounen manga by Yagi Norihiro serialized in Monthly Shounen Jump.
Long ago, Youma, shape changing demons, took human form to live in disguise in human towns, feeding on them in secret.
A secret, nameless society has discovered a way of implanting Youma flesh into humans to create hybrids powerful enough to defeat the Youma. A hybrid's standard abilities include faster healing, limited shape modification, the ability to detect Youma and other hybrids, and overall enhanced physical prowess allowing them to wield massive claymores, for which they are named: Claymores. For reasons not divulged, only women are selected to be Claymores. They are often chosen for implantation after being the sole survivors of a family attacked by a Youma; this ensures their loyalty and willingness to endure the painful hybridization process.
The society sends Claymores to towns that can afford their fees to kill Youma. The society is often strict and harsh; Claymores who break the rules risk being hunted down by their fellow warriors.
The story of Claymore follows the adventures of the beautiful warrior Claire, who fights demons while struggling to hold on to her own humanity.
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3- bounen no xamdou ( my favorite )
Akiyuki, the main character, lives on Sentan Island, a land that has preserved its status as a free and peaceful island in a world consumed by fighting between the Northern and Southern Governments. All of this changes when Akiyuki boards a bus along with a mysterious white-haired girl who transforms his arm with the lost memories and power of Xam'd.
As Xam'd, Akiyuki goes on a rampage and is saved when a foreign girl with red hair named "Nakiami" calms him down, taking him back to her postal vessel. Akiyuki now must gain control of his powers and use them against the Northern Government's latest weapons, known as "Humanforms". Travelling the world on a postal vessel, Akiyuki hopes to return home one day, but until then he befriends other passengers on the boat.
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4- bokurano ( must watch !! )
In a summer vacation, a group of 15 children discovered a mysterious man living in a seashore cave, along with his high-tech gadgets. The man claimed to be a game developer creating a video game with 15 giant robots defending Earth from alien invaders and asked those childs to test the game for him. The kids agreed happily at first, but soon they began to find the game horrifying, not only because of its realism but also for the first fatality among them happened right after their first victory. Worse yet, they had no idea how to stop or leave the "game."
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5- Tengen Toppa Gurren Lagann ( amazing anime )
In the distant future, people build their homes and raise domestic animals in subterranean caverns. As a result, they live in fear of the occasional earthquake and cave-in, and have been for hundreds of years. Jeeha is one such village.
One day, a boy named Simon happens to find a small, shiny drill while digging to expand the village. At the same time, Kamina - Simon's "Bro" - believes that there is another land above the village, and tries to break through the ceiling in order to leave the cavern, but fails. Suddenly, an earthquake occurs, the ceiling collapses and a gigantic robot - a Ganmen - crashes to the cave floor.
Kamina is now sure that there is a world above them. Recklessly, he begins to fight against the robot, and discovers that another person has arrived from the land above. It is a girl by the name of Yoko from the neighbouring village Ritona. With a rifle in hand, she had been hunting the robot, but here rifle shots only irritated the robot. Trying to escape its attacks, Simon shows Kamina and Yoko what he had previously found: It is a mysterious robot with a head as its body.
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