Revealed by a stranger, we learn of the reason behind Serizawa's anger. Later on, the Roshigumi receives a new name.
gained its fortune by 
trading with foreigners.
est coupable d’avoir commercé
avec les étrangers.
di guadagnare una fortuna 
commerciando con gli stranieri.
незаслуженно обогатилась, 
торгуя с чужеземцами.