[Tensura x Mairimashita! Iruma-kun] Field Trip to the Demon World

The newly assigned Demon Lord, Slime Rimuru have now completed the Walpugis and have became a true demon lord by name and status. He too have put the western church in their place and peace have returned to the nation of monsters, Tempest.
Having done festivals after festivals to celebrate the return of Rimuru from fulfulling his promise to Demon lord Karrion with the rebuilding of Yuurazania, the country of beastmen. It reminded Rimuru's new subordinate, Diablo, of a certain Demon King and his grandpa.
After speaking to Diablo, Rimuru was intrigued by this being and decided to plan a little field trip to meet with this person that Diablo spoke of. After all, It wouldn't hurt to get more help and support of people of different races.
The goblins, the ogres, the orcs and even the humans. And now its time to befriend some demons.