Aside from what others have mentioned already, MC was also requested by one of the teachers to keep the club from disbanding to preserve the school order.
And they’re correct, fresh sashimi just melts in your mouth. Definitely one of those foods that really depends on the freshness and quality of the fish though, which isn’t as much of a problem for an island nation.
The whole “sin-bearing executioner” deal seems a bit on the nose to me, I get the impression from that we’ll be dealing with a reluctant assassin working against their will that our girls will help pull a heel-face turn.