V3 Universe is a rebooted universe that has nothing to do with the HPA Universe.

There were still two killing games for DR1 and DR2 casts, the survivors are as follows:

Makoto Naegi
Mondo Oowada
Hifumi Yamada
Chihiro Fujisaki
Sayaka Maizono
Kyouko Kirigiri
Touko Fukawa(Genocider Syo)
Junko Enoshima(It is unknown if she is evil in this universe or was the mastermind of her killing game.)

Hajime Hinata
Teruteru Hanamura
Akane Owari
Ibuki Mioda
Chiaki Nanami
Hiyoko Saionji
Sonia Nevermind
Mahiru Koizumi

The rest of the DR1/DR2 casts are assumed either dead or part of a new terrorist group similar to ultimate despair lead by Mukuro Ikusaba. It's probably the former though.

Due to this, AE's events are different with Komaru dying and Yuta living. DR3 doesn't seem to happen at all in this universe.

The V3 kids fled to space due to an event that causes the world to go into a catastrophic tragedy and their plan was to stay up there until things were safe. Shirogana Tsumugi however erases everyone's memories and puts them all through a killing game.