Raj is back home and Shirayuki’s place in the castle is secure, but now half of Wistal is convinced she’s actually Zen’s fiancee, for better or worse, so Zen assigns Obi, recently returned from a no-supervision trip to test his trustworthiness, to guard her. The two have had a prickly history together, but end up getting along. The problem is, the Chief herbalist tries to pull a prank on them, unaware of just how much Shirayuki can’t handle her liquor.
With Shirayuki thus knocked out, the rest of the episode is given over to the story of how Mitsuhide was assigned to Zen, just as Obi was assigned to Shirayuki. Mitsu struggled to connect to the young prince, who said he had to maintain distance to maintain authority, like his brother Izana (who ordered Mitsu to guard him), yet has an increasingly suspicious secret friend and brother-like figure in the archer guard Atri.
Like me, Mitsu was almost instantly weary of Atri, him because of his instincts, me because of all the shots of him making an arrowhead and squinting forebodingly into the camera. The last straw is when Atri says he’s switching to the night shift and would like it if Zen came out to see him then. Zen was obviously very naive around this time.
Fortunately Izana assigned Mitsu to him when he did, because both of them are able to stop Atri’s associates, disgruntled rebels from Lido, from capturing or hurting Zen; Mitsu even manages to slice Atri’s arrow in two while it’s in flight, which is almost incredulously badass.
The naive Zen largely died that night when Atri, someone he thought was his friend turned on him, having waited for his opportunity the whole time. Even so, Zen mourns Atri’s death, and Atri remarks that it might have been better if Zen wasn’t a prince, otherwise they wouldn’t be in such a situation and could have been friends.
Obi gives Shirayuki the same line (which Mitsuhide overhears, leading to this flashback), but Shirayuki warns Obi not to talk like that, lest she take it as an insult. Zen is a prince, she’s an apprentice herbalist (who later accidentally gets toasted). On the path she’s traveling, she’s accepted all these things, and like a good politician, isnt’ about entertaining theoreticals.