Before Eri joined the Resistance she lived in a poor neighborhood which made working hard to find and education was difficult to understand. Luckily Eri was able to find a good school where she met Merino (goat) and Valerie (cat). They all had hard lives too so they all became friends. Merino became a farmer in a field and Valerie was a sailor in the east seas.
Eri was happy to see them again and often refers themselves as the Three amigos just a female version of it.