Colorless December is known as Mushoku Jū Nigatsu, The Twelfth Moon of Nothingness as well. The Colorless December is a clear glass like Tanto, which looks somewhat like a large butcher knife. Like other thirteen month weapons, Colorless December can be summoned back to its user. The main ability lets the wielder shape various glass mirrors and glass shards. The glass mirrors double as a doorway to a sanctuary that the wielder can alter according to their will. Stabbing an object, or target in the chest allows the wielder to seal said target within the blade. The seal comes undone if the blade gets too far from the wielder. ( works on solids, or liquids.) After the awakening, the wielder can access the jutsu, or prowess of the individual or object sealed in the weapon. Stabbing oneself in the chest allows them to manifest a double with both now having twice the power of the original. The double shatters when destroyed from taking significant damage. The wielder can reflect anything they want in the blade and create an identical copy from its mirrors.
Yukimi is the soul inside of the Colorless December. She is often noted to be very funny and generous to her partners. She often forgets or makes a habit to not follow any plans made, and considers being bound in the weapon annoying. She makes promises to her partners out of habit, even when she knows she can't live up to it, she does her best for them. She is the second youngest of all the sisters and often tries to get babied by everyone. Her partners often win her over by offering to travel to new lands.
