Also known as: 血月, 赤い月
Any image depicting the Moon with a distinct red tint or glow. Also called a "blood moon." This is often considered an evil omen.
In real life, the moon turns red during a total Lunar Eclipse because sunlight is completely blocked by Earth (Planet) and the only light reflected from its surface has been refracted from Earth's atmosphere, which is red in color for the same reason that a sunrise or sunset turns the sky red.