 If you liked
Shingeki no Kyojin
|
 ...then you might like
Iron Knight
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Dark, shounen action/fantasy manga. Both are about boys caught up in a violent world full of monsters who are trying to eradicate humans (goblins in Iron Knight and titans in SNK). The main protagonist lost his mother as a child and has an odd relationship with his father. He also has a very strong bond with his female childhood friend. The main character unintentionally acquires powers in order to fight the monsters and is determined to save as many people as he can.