A long-running conspiracy is swirling over a mysterious power wielded by the Queen in Raja, a small country west of Tempest. When a slime who evolved into a Demon Lord named Rimuru Tempest crosses paths with Hiiro, a survivor of the Ogre race, an incredible adventure packed with new characters begins. The power of bonds will be put to the test!

Spin-off series from Ranking of Kings (2021) that recount the side stories which took place in-between the main events of the original series.

In this spinoff series, Rimuru gets his hands on a notebook and decides to compose a record of his many adventures. But where to begin?

The people of the kingdom look down on the young Prince Bojji, who can neither hear nor speak. They call him "The Useless Prince" while jeering at his supposed foolishness.

Hachiman Hikigaya is an antisocial high school student with no friends or girlfriend and as a result has a distorted view on life. When he sees his classmates talking excitedly about their adolescent lives, he mutters, "They're a bunch of liars." When he is asked about his future dreams, he responds, "Not working." A teacher gets Hachiman to join the volunteer "service club," which happens to have the school's prettiest girl - Yukino Yukinoshita.