Hyperdimension Neptunia Re;Birth3 V Century is a port of Hyperdimension Neptunia Victory for PlayStation Vita. Felistella handled development and their mascot character, Stella, is in the game too.
You won’t find Stella fighting alongside Iris Heart in battle, though. Stella has her own dungeon crawling mini-game just like Hyperdimension Neptuina Re;Birth 2 Sisters Generation.
Hyperdimension Neptunia Re;Birth3 V Century is scheduled to come out in Japan on December 18.