This episode explains everything about Michiru. During the flashback, it feels like the studio left out something about her best friend. Honestly, I think that’s somewhat fine because if it was revealed, I feel like my blood pressure would have gone through the roof. I already have a theory about what happened and based on the circumstances, I feel like my deduction might be pretty close. Unlike the previous episode, this one ends on a much more lighthearted note. P.S. Vox is Latin for "voice," which I think is a fitting title for this episode.