Bunny seems to actually feel bad for almost accidentally killing Kyoto.
Kyoto, who is normally calm as a cucumber, loses it when she thinks Bunny has died.
Bunny is being attacked by someone who is using Kyoto's magic and the easiest way to end the fight is to kill Kyoto, but Bunny, who sometimes kills just to do it, can't bring herself to do it.
Slightly less heartwarming is an alternate comic that more closely followed Bunny's sociopath personality and had her kill Kyoto. The heartless Bunny who kills people with no thought and zero care, can't stop crying and saying she's sorry.