First Frost Shimo Hajimete Furu, one of the "72 climates" of the solar year. This one corresponds to about Oct. 23 - Oct. 27, associating late autumn with frost beginning to settle on everything.

Ch-...chestnut youkan!? Youkan = sweet bean jelly

It's the 13th night of the month.

Since it's the chestnut harvest moon, I thought we'd have all sorts of chestnut dishes.

Come now, help me peel the chestnuts.

They're so small, I can't draw them out...

Just pinch one gently between your fingers and spread it open...

Ah! Let's just get us a squirrel from somewhere!

Squirrels love their nuts! Squirrels love their nuts! Originally, "risu to kuri" ("squirrels and chestnuts"), a barely-hidden inversion of "kuri to risu", punning on "clitoris".

? What's the matter, Murasa?

Nothing...it's just...

Maybe I'm a little depressed that it seemed like something was starting up, but didn't...

You don't mean your period?

Oh, so it's her period.

Since it's a moon-viewing!

"So it was just a dirty joke"...

...the commander didn't say aloud.