"Yukkurin"
Seemingly a made-up word, likely based on saccharin.Its base material is harmless, and it has nothing but sweet-taste.
It's specifications have no differences to common yukkuri foods'.
Rather, it has even more sweet taste than cheap yukkuri foods to raise attractiveness.And the "sweet-taste" is the repelling ingredient of this repellent.It's the chemical extract of what makes yukkuris feel "sweet". In other words, it is a composite sweetener.The repellent does NOT have any ingredients that are harmful to yukkuris' bodies.