All the weapons, items, experience, and quests you acquired at the time of Ending A are maintained and carry over to this playthrough. This resets the game near the start of Part 2, at the point you reverse Kaine’s petrification. You’ll be given the option to experience Kaine’s Story. Load the file you saved after reaching Ending A. Change Music feature - Allows you to swap the game's soundtrack with NieR:Automata's soundtrack.
Your save file will now feature an “A” icon to demonstrate you’ve reached this ending. Make sure to save your progress after the credits roll. This is obtained by completing all the Story Missions in Parts 1 & 2. Ending A is the default ending you reach the first time you reach the credits.
