Yeah, everything is getting dragged out. If we check the past 30+ chapters, it was :
Getting the vaccine, but the brother get it first. - 10 chapters +
Brother challenge after all the trouble they had in the mine - 10 chapters +
Brother lose the challenge, but drag the fight - 10 chapters +
It's like this whole arc is to say goodbye to the brother, BUT WE DID already said goodbye when he died trying to kill Myabi.
I still wish to continue reading it, but the last arc was so boring.