Prologue: The day no one wished it would happened

The young boy had 3 childhood friends and he was born in Shiganshina, after Wall Maria was breached, humanity acted like cattle and decided to retreat behind Wall Rose, he didn't know what to do but just to find a way to retake Wall Maria, but what eventually happens when he falls in love with Christa Lenz

And what he doesn't know.

Her real name is Historia Reiss

note: Attack on Titan is not mine!!! All credits to Hajime Isayama!! There are some Inapproriate words in the story