How to Unlock The True Ending in Neon White

screenrant.com:

The True Ending, also known as the «Book of Life Ending,» is an unlockable conclusion to the story in the Ghostrunner-like FPS platformer Neon White. After the tense final battle with Green, White has the opportunity to either write Green's name in the Book of Death or the Book of Life. To get the True Ending, players must select the second option, forgiving Green and putting his name in the Book of life. However, this ending in action platformer is initially inaccessible to the protagonist, revealing to the player that they do not have enough Memories to proceed.

Memories are collectible events in Neon White that players will obtain as they increase their Social Link level with other characters and NPCs. Acquiring every Memory will reward players with the «Whole Again» Achievement, indicating that the protagonist has successfully accumulated the ten available Memories in the game. To progress one's Social Link relationship with another character, players will need to find Gifts hidden throughout various Levels of the story's Missions.

Related: Ghostrunner Review: Sometimes Slick, Sometimes Slow

Gifts in Neon White appear as large wrapped presents that players can find and collect before completing a Level. These presents are usually located in a remote location or spot that requires some thoughtful planning and mechanical parkour skill to reach. Of course, the effort of finding a Gift will require the player to leave the main path and forfeit their Ace Medal. Therefore, gathering Gifts should be a side activity separate from beating time limit challenges.

Gifts come in boxes and items with colors that correlate with whom White should deliver the present. For instance, Six Packs should be given to Yellow, and Tattletail