If you're looking for anime similar to Seraph of the End: The Beginning of the End, you might like these titles.
Over a century ago, mankind was devoured by giant beings of unknown intelligence and origin known as Titans – creatures that eat humans alive indiscriminately and for no apparent reason. The remaining population has managed to survive the last hundred years only by building a multi-walled city capable of keeping the Titans at bay, training military recruits to patrol the perimeter and gather intelligence about their mysterious foe. Eren and Mikasa have lived a relatively peaceful life behind the city's walls, but when a massive Titan appears, smashing the outer barrier and unleashing a wave of terror, their lives are brutally changed forever...
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Both Yu and Eren are motivated to become soldiers because of their desire for revenge. Also both are full of action and monsters. They both have characters you'll become attached to!
A recap of the first three episodes of Hellsing (TV), in the animation style of the Hellsing Ultimate OVA.
Years ago, a great unholy rift opened in the center of Tokyo, turning Shinjuku into a demon-infested slum. At that time, a great warrior fought their leader, but was defeated. Now, the unholy forces reach out, targeting the one man who can bring peace to the war-torn world... a young boy must now do what his father could not--defeat the evil that lives inside Demon City Shinjuku!
The Demon King Zenon has announced that the strongest of his three best warriors will take the body of a human and destroy the human race. After a quick battle, Devilman is victorious and assumes the life of the now slain Akira Fudou. However, 'Akira' soon finds his plans utterly foiled when the daughter of his new caretaker, Miki, is revealed to him for the first time. Akira quickly falls in love with the lovely Miki, casting him a traitor with the devil clan. With his mission forgotten, Akira must now fight the minions of the Demon King at every turn to protect the woman he loves.