
so, therian, when he was a child used to love drawing as compared to his 3 older siblings who used to train for wars, long story short all of his 3 eldest siblings die during war leaving his mother traumatized, she was bit shaken by it and therian couldn't bare to watch his mother act so unstable, so he thought about giving up on drawing and welding sword like his dead siblings and started learning in academy, he got bullied and stuff but he didn't give up, alas after 3 years of training he returns to home and rushes to his mother, but seeing him in uniform made his mother think it was her eldest son (viktor) who died in battlefield, I mean she refused to believe her kids death and throughout the 3 years she completely lost it, so after seeing therian she thought it was viktor, therian felt sad cuz after giving up on everything and training for 3 years likw crazy his mother didn't acknowledge him, so he leaves the house after arguing w his younger twin sister (they argued cuz out of anger he said he wishes to die on battlefield like his siblings so his mother will acknowledge his efforts) anyways, he goes to his uncle who is the main general (?) and fought along w his 3 dead siblings, his uncle gave him 2 options, 1 to stick w him and wait for the work deals to come, which will take, days, weeks or even years and 2 was a mission to spy hildegear's place (kaya), and at the end of this arc he (therian) sends a letter to his twin sister saying he's doing fine

It's very helpful. You explained everything clearly.. In episodic stories, we learn about the main character little by little, while side characters take the spotlight each time. But In serialized stories like this, we usually get to know the main character first, then dive into the others. But this manga flipped that around. So it threw me off i guess.
I really can't concentrate on Therian's backstory from chapter 55-62
Can anyone shortly explain what happens in those chapter cause I want to know what happens to Elkin and Kaia.