A commemorative day established by the Japanese Nuts Association!The 22nd of July is...It's summer, so you can say it's Nuts Day!
What Suika is saying is based on a pun: summer is said as natsu, and nuts is pronounced as nattsu.
The actual reason why the 22nd of July is Nuts Day is because of a different pun. Geminated consonants are represented in Japanese with a smaller "tsu" character, therefore nattsu → natsutsu → na (short for nana, 7) tsu (close to the English pronunciation of 2) tsu (ditto).Your nuts will not be safe eitherEh? You say that's nonsense? Are you really sure you want to pick a fight like that?CRRRACK