Wow, this episode was great.

Churi's poise has grown leaps and bounds since season 1. Being a frontgirl has done wonders.
I loved seeing faces break character in the old H!M skits, so the Rena slap scene was gold for me. Much less that amazing one-eyed bride bit. Wowza.

Kumi is great, both for the drama and the comedy. Rolling-eyes Kumi LOL. Metal!Kumi was hilarious this episode, but I hope they mix it up with other stuff in future episodes, as that's a gimmick that won't work multiple times, unlike the Rena monologues.
Except now, instead of monologues we get letter-readings!

Omg. Dying. Rena old-man imitations are so much win, reminds me of Makoto's old-man imitations.
Lol poor Goma. But her hitting Wakabayashi was also great. And of course his horrified scream on learning about the letter switch was brilliant.