Have you ever seen seeds that turn pale or turn blue? If you see someone's lips turning pale or blue, it means you are finding someone who is sick, cold, dry, dead...
The condition of the aunt who lacks oxygen in the blood makes the lips turn blue, or more accurately called Cyanosis. The cause of the occurrence due to exposure to cold temperatures that make the body temperature decrease or hypothermia. Cold air can make the blood vessels in the body constrict so that oxygen levels flow throughout the body are reduced.
That BOSS, Sakata Sakamoto, got Cyanosis as a result of my skill. My skill hit his lips, causing his lips to turn blue for a while, this indicates that his current body is deprived of oxygen in his blood. This means it's a weakness I can take advantage of.
