I want to assume another Kanako Is An Old Hag joke, but without her being the punchline in the 4th panel it's hard to say.

usuallydead said:

I want to assume another Kanako Is An Old Hag joke, but without her being the punchline in the 4th panel it's hard to say.

It's a "Hecatia wears weird T-shirts" joke. (The letter is addressed to "Weird T-Shirt")

djseifer said:

It's a "Hecatia wears weird T-shirts" joke. (The letter is addressed to "Weird T-Shirt")

In the space for the postal code, no less.

Wait, didn't he already do this joke years ago?

hemlock said:

Wait, didn't he already do this joke years ago?

For shame, Jetto. For shame.

On an equally joking note, you can actually read that one as a "Kanako is old" gag too, since she forgot the same thing happened before assuming this one takes place earlier in time.