Tensei shitara Slime Datta Ken

Synopsis

Shizu's students don't show Rimuru much respect so he decides to show them the difference in their skill in a series of duels. Kenya uses fire magic, Chloe water magic, Gale fires magic bullets, Ryota uses body enhancements, and Alice uses puppetry to control toys to attack him. They lose and accept him as sensei. Rimuru visits Treyni, believing the children will survive if inhabited by superior spirits since Shizu was Summoned as a child but lived to adulthood, possibly because of Ifrit. Treyni directs him to the Dwelling of Spirits, but with the Queen of Spirits the dryads once served dead, they have lost their link to it and no longer know the entrance. While on a picnic with the students, they see a Sky Dragon heading to the capital and Rimuru interferes and eats it with Gluttony. Mjolmire, a merchant Rimuru's appearance saved, invites them to dinner. Mjolmire knows who Rimuru is and Rimuru invites him to come to Tempest to help them sell their wares. He agrees. Mjolmire's assistant asks the Queen of Spirits to protect the children after dinner. She tells a curious Rimuru she came from a village near the Dwelling of Spirits. He, Ranga, and children head to its location.

(Source: Wikipedia)