Just to clarify the words in advance:
蒸し暑い – mushi-atsui is a word that gets used a lot in the Japanese summer. It means humid-hot – and that’s what the Japanese summer is like!
It actually has nothing to do with 虫 mushi – bugs, but the association of the two things is so close that it makes a very good mnemonic.
As for 無視 mushi meaning to ignore or disregard, well, that’s just another word altogether.
So now you’re clear on the real meanings of the words, sit back and enjoy this two-minute episode of Kinoko Channel where our heroine is menaced by flying kanji!
It should fix the words in your mind forever!