The Myogi's first post-Aisaka trial mission is rather routine to ease the ship back into service:

Commander Seiji Iwaki of the Nebula Class USS Nikko has for the longest time been harassing Federation-bound Klingon shipping, stopping and boarding Klingon ships to inspect their cargoes, even though most ships have no contraband to hide.

Iwaki's actions have angered the Klingon Empire, who are threatening war with the Federation. Looking to avoid war, Starfleet has dispatched the USS Myogi to take Commander Iwaki back to earth to stand trial for war mongering.

The Myogi's mission sounds simple. However, things are complicated when Commander Iwaki isn't willing to surrender himself: In fact, he believes he's actually doing the right thing by protecting free trade within the Federation.