Safe Landing ability can be obtained through a sticker. It prevents additional damage when hitting the ground after a knockback.
Neku's partners get this ability automatically early in their respective Games. Neku himself needs to get the sticker from Edoga the Shop.
This ability is activated by pressing the D-pad/ABXY buttons (partner) or tapping on the touch screen (Neku) before landing. This will cause the character to "stand up" in mid-air and fall vertically from the point that they "stood".