What an emotional episode! I had some tears the whole scene with the teacher and the collector. Man, the teacher was a great character. Wish he was a main character, and he is definitely the best gate. Side plot with the kid hit me in the feels too.
Also, interesting to see both Wizard and the Phantom get the Gate's hope completely wrong, as well as Haruto prepared to let someone fall into despair to get Fueki's attention. Shunpei's role this time around was good as well. I'm excited for the next couple of episodes (Todoroki!), though the twist with Koyomi was pretty obvious (at least... if it ends up how we assume it will).
Great episode, hope the final 6 wrap things up nicely!