There you go, now we know that you lose both hardant and image.
Losing a hardant upon leveling is not such a bad idea as it will allow you to equip another that will likely (assuming you buy a higher level hardant) have better bonus stats than the older one, without the need to use the item that allows you to remove unwanted hardants. Even if you do not want to buy another set you could use leftovers as they come in packs of 3. Therefore, I do recommend continue to equip hardants on E1 to E3.
The worst part is the image, as you will either lose the image or obliged to buy another crystal pet just to keep the image, when leveling up.
Recette - Witch 400 | EmiriTachibana - Diva 400 | SakuraHiiragi - Champion 35x | AnaJessicaAyano - Soul Master 26x | LeslieSun - Witch 26x
Bye Bright Shadow Japan, I will miss you all and my bunch of characters very much ~~