What does it mean these symbols?


![enter image description here](https://i.stack.imgur.com/3Vbzw.jpg)

Levi is trying to clean the room with the vacuum cleaner




I believe "tch" represents a sound this character is making by pressing his
tongue against the roof of his mouth and expelling a small amount of air; this
conveys impatience, annoyance, or irritation. Likewise, the イライラ in the
background shows that he is feeling annoyed.

