LOAD SAVE is one of AKEMI HOMURA's unique skills, allowing her to reload her 'game' from the last save point.
This can also be used to bring others back with her, using MASS RESET. Kyubey may be able to attach himself in this manner; whether this is the case is unknown.
It is not known if in v2.0 there is a limit to what skills Homura can bring back, but there doesn't appear to be such a limitation as there was in v1.0.
Spend 20 MP to return to the first day of Homura’s new life. Injuries and physical status effects are reset; MP is not reset. Points gained from levelling up are refunded. Skills and items in [INVENTORY] are retained. Autocast upon death.