Nimi-san has gone against the Shinsengumi. To avoid anymore problems they want to get rid of Serizawa.
We have been charged 
to protect the peace,
،تمّ تكليفنا بحماية السّلام
Wir sollen den Frieden wahren
Nos pidieron proteger la paz,
Nos han pedido proteger la paz,
On nous a chargés
de l’ordre public.
Ci hanno incaricati di proteggere la pace,
Temos o dever de manter a paz,
Нам поручили охранять порядок,