In Sunshine Sketch #2, there is a chapter where the group goes to the zoo to sketch animals.
When Yuno draws a hippo, she draws a hippo holding a glass of water saying, "After you come home..."
The hippo is telling you to gargle when you come home.
This is a reference to Isodine, a mouth rinse concentrate sold in Japan.
It is one of my must-have items at home.
In fact, I ask for it every year when guests come to Anime Expo.
Last year, S-san from GAINAX bought me a 250mL one, so I'm set for about 2 years.
You can check out the product here.
You should turn off the sound before you click.
