First, the narrator explains that a character called "Nuclear Boy" had a stomachache. Then he PASSED GAS, but nothing SOLID came out, which is good.

And apparently Japanese kids learn about the Periodic Table of Elements a lot earlier than we do, because there's one part where it talks about the chemical "boron" being used to help make sure Nuclear Boy doesn't get too hot.

If that happens, it says he could have "diarrhea" like "Chernobyl Boy" did.