About as quirky and original as I was expecting from the PV; SHAFT really showing off their style with this series.

I was not expecting the music to stand out that much as well. It's rare for me to enjoy as many songs as the first episode played. I really like the song for the OP though I wish the animation had more to it; no idea what they're planning for the ED in future episodes.

There's a bunch of unanswered questions after that episode as well. The obvious being what causes the world to change (brother's desires?), and if there's a specific reason why he's hiding his face (he knows about the surveillance?).

EDIT notes:

• Loved how they timed the BGM to Sasami opening her delivery box with her nails.

• Code Geass reference or just similar symbol?

• As mentioned below by messem10, Sasami mentions "Koi to Senkyo" during her choco 'amazonas' search.

• Tama seems to protect Tsurugi as Kagami does her 'change the world back to normal' ability -- foreshadowing? Tama does have that barrier/engulf/eating? ability.