Its poison to people with high mana....
Since our MC is someone who doesn't have much mana she got turned back to younger version(also reason why she dared to drink in first place...if our ML he would have very worse reaction approp for that girl's bf to come and conquer)while our ML is drinking youth potion or something similar so maybe he can marry our mc without law standing in the way
I thought they said it wasnt Robet but actually a highly toxic (Not sure if poison or potion) that could kill weather you have high or low mana
Huh....did i miss that....do i have to read this all again?
Thanks mate... (=・ω・=)
So it wasn't poison but a potion to restore youth that our little potato drank that made her young