... I don't get the third panel.

MarqFJA87 said:

... I don't get the third panel.

A card where children do errands for their parents and if the card is full they get a reward.

I assume it's a popular child raising method in Japan.

stoicapple said:

A card where children do errands for their parents and if the card is full they get a reward.

I assume it's a popular child raising method in Japan.

It's to teach responsibility

Why does Yukari just appear for no reason?

Kapten-N said:

Why does Yukari just appear for no reason?

She's acting as a point of reference, showing that the scene would be confusing to anyone that just happened to stumble upon it and thus illustrating the humor for the audience.

Plus Yukari's 0_0 + :3 is always funny to look at... :)