Replicate: i understand that everyone is confused so let me explain from the begging, Hanahaki is not exactly a neighbour nor a human, he was Hugo Kugas experiment
Kido: experiment?
Replicate: indeed, in order to stop the constant battles and war that was on going in his nation around the time Yuma was born, Hugo was trying to find a experiment that would aid him in his needs so, in his time pass as he was raising Yuma, Hugo went from 1 nation to the other, collecting Trion and mounting them together and save it in a secret, than from a single DNA from Yuma he made a prostheses that would go on to look exactly like his son, he also created me as a way to guide the boy in his journey, thats when Hugo found a black trigger in a battle field after a war on another nation, he took it back and soon he operated his experiment, giving all the Trion he collected threw the years into the prostheses making sure its enough to make it being able to wield a black trigger than give said trigger to him, his experiment was a success and he named it Hanahaki, a prostheses made to be exactly like a neighbour and human with combat abilities beyond both kinds, around that time Yuma was allowed to be on the battle field to help the people in need at war
Yuma: hmm that was a long time ago, a few years after the journey threw the nation's i think
Replicate: once everything is complete, he thought Hanahaki everything he needs to know and than send him out to explore other nations, and not only did he explore them, he also faught along side their people and gain many informations about them, the newly strong type of Trion soldiers they produce are all taken down by Hanahaki and he has learn how some of them even plan to attack Meeden
Kido: ....
Replicate: once he has journey threw all the nation's, Hanahaki would go to return home to finally be introduced to Yuma as his brother but by the time he return, we were told Hugo died and became Yuma black trigger and that Yuma has left to Meeden
Hanahaki: w-we... we didnt have munch to do... sience theres no war back home.... s-so we just thinker to go f-find big brother and stay with him...
Yuma: big brother huh? I like the sound of that, i never thought i would get siblings run along a twin
Chika: this is so munch to process... but um Hanahaki you been to Aftocrater right?
Hanahaki: y-yes... some of them m-might remember me sience... i um... i kind of help them fight another nation... but than i fought the small nations that w-work for them... uhh... they didnt like it... it was awful there...
Kido: than may i ask, we're you the 1 who defeated the Trion soldiers infront of our base the other day?
Hanahaki: y-yes... i recognize them f-from the small nations t-that work for Afto... s-so i thought you were in trouble... and destroyed them... for you... i-im sorry if i caused some kind of trouble
Jin: hahaha awww so shy!
Yuma: i did say hes shy
Jin: don't worry pal theres nothing to be afraid of
Replicate: apologise, that is just something made within his mind, its just how he reacts to meeting strangers
Yuma: haha he was super scared of me the first time i caught him

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???: omg call 911! We hit a kid- uh?
Hanahaki: oh god! I-im so sorry!! I-i-i didnt mean to destroy your vehicle thing! I-i
???: hey its ok-
Yuma: uh excuse me I'll be taking him back now goodbye and heres for the trouble

Yuma grab Hanahaki and left a block of cash than ran off

Yuma: hi I'm Yuma and you, why do you look like me? Which nation are you from?
Hanahaki: ahh!! I- well um... i uhh im- ahhh idk!
Yuma: woah calm down buddy I'm not starting a fight
Replicate: apologise this is just how he reacts when he meets new people
Yuma: uh- you...
Replicate: greetings i am Replicate, his gaurdian and this is your twin Hanahaki

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Yuma: it took me a good long while to convince him to go to Border