Hyojin

In this world, some women can awaken to something known as hyper. These awakened women are called 'hyper girls' and are required to join the Hyper Association, where they are categorized based on the strength of their farts.

Grade D: The strength comparable to the powerful farts collected over a week and released over 30 minutes. For ordinary people, this would be lethal, but among hyper girls, it's on the weaker side. (Lower-middle strength)

Grade C: The power of farts collected over three weeks and released with an extremely loud sound for one hour. (Middle-low strength)

Grade B: The equivalent power to farts gathered over six months, released for six hours with an extremely loud noise. At this level, one could die from wind pressure before suffocating. (Upper-lower strength)

Grade A: The level of farts collected over a year and released after a week of extremely loud sounds. (Upper strength)

Grade S: The strength level of farts collected over half a century and released after a month of very loud farts. Even if all other hyper girls' farts were combined, they would be weaker than a Grade S fart girl. (Top-tier strength)