It is very easy to manage Eris ("No banana, no life") - offer her bananas as reward. Makoto is the only supplier of it in that whole world (and demiplane). Smart move by Makoto to have Eris watch over his students. He put in effort teaching them and is not ready to lose them. It would also look badly on Shiki and him if they got hurt since it was Shiki who suggested the class go monster hunting in the wild.
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