For example, the "Adventurer's Arc" (a small arc which displays how Rimuru bought his Adventurer's License, sheds some spotlight on how the Adventure Guild will work, and presents Elen, Kabal, and Gido some extra growth and screentime) isn't coated by the anime exclusively, but alternatively will get shown in the 1st Opening of Season 2, demonstrating Rimuru about to head out with the three adventurers, as perfectly as his "evaluation" fighting.