Was that Haru and Chiaki (of 'A Secret Between You and Me') making an appearance at the end?!
Also: Ao-chan seems like a character Noto Mamiko would voice.
Is this like when a stray cat gets neutered and it also gets a triangle cut out in it's ear to show that it's neutered? I'm only referencing to the ear part.
Huh. I hadn't heard of this, but it makes enough sense to me. Ya learn something new everyday. :D