Rimuru has to earn the respect of the five summoned rascals before he can teach them anything (to say nothing of saving them) so he brings out Ranga to make sure they say their names when he calls them. He then gives them an opportunity to take him down, hoping they’ll expend some of the magicules that may one day kill them.
The kids go up against Rimuru one by one, but while they all have pretty good skills and may even be a problem for anyone else, against Rimuru they’re basically doomed to an embarrassing defeat. Since no one other tan Shizu has ever been able to stand against them, they’re understandably upset (though he doesn’t go so far as to burn Alice’s stuffed animals).
Rimuru then whips out Shizu’s mask, which he tells them she entrusted to him, along with the five of them. He promises he’ll save them from a cruel fate, thus earning not only their fear or respect, but trust. But to do so, he suspects he’ll have to find some serious superior spirits.
A quick trip to Treyni’s comes up empty, as she forgets the one way to reach the “Dwelling of Spirits” ever since the Queen of Spirits she served passed away. A whole month passes, during which Rimuru forms a stronger bond with to Kenya, Ryouta, Gale, Alice, and Chloe, but gets no closer to finding a solution to save them.
Then a sky dragon suddenly appears in the, well, skies, offering Rimuru a chance to show them what he can do. Slightly changing his appearance in case anyone else who knows him is watching, he flies up to the dragon, absorbs its lightning attacks, then altogether consumes it with Devour, drawing further esteem from his pupils.
Rimuru is later told by Grandmaster Yuuki that one of the people he saved was the distinguished merchant Mjolmire, who has invited him and his class to his mansion for dinner. During the sumptuous feast (with both adult and kid’s tables), Mjolmire admits he knows who Rimuru is, and he jumps at the chance to do business with the Jura Tempest Federation.
But like Treyni, Mjolmire doesn’t know anything about where the Dwelling of Spirits is…but one of his servants does, something Rimuru learns when she sees him and the kids off with a prayer. Her information leads them to the Ulg Nature Park, where Rimuru and his class set out immediately to explore and seek their very salvation. In other words…field trip!!