THAT TIME I GOT REINCARNATED AS A SLIME - LIGHT NOVEL (2017) DIGEST-SIZED NOVEL #14

Having easily thwarted the Eastern Empires invasion, Rimuru wishes to end the conflict once and for all and therefore heads for the imperial capital to take out the source. Meanwhile, Yuuki has worked his way up inside the Empire with the intention to stage a coup détat and usurp the throne. Rimuru, however, comes to find that the Empires true power is on a whole other level from what hes seen so far...