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The Yin-Yang promise is a beautiful and sacred tradition, Jay. Congratulations.

The Yin-Yang promise is a sacred tradition practiced by the people of Ninjago. A piece of a medallion with one half of the yin-yang symbol is presented to a romantic partner, signifying their promise to be one with each other forever.


The Darkness Comes

Jay practices his Yin-Yang to Kai, but he says that he is doing it wrong. When Dareth comes in, Kai tells him, much to Jay's disliking.

Into the Breach

Cole finds out about the Yin-Yang and gives Jay advice, though he unintentionally compares Nya to an old bandage. Later, Jay tries to start the Yin-Yang but is spooked by Garmadon.


Jay proposes his Yin-Yang to Nya.

Queen of the Munce

Jay mentions it when he introduces Nya to Queen Murtessa.


  • The Yin-Yang promise was previously stated to not be the Ninjago equivalent of a marriage proposal and a separate love-related custom unique to Ninjago.[1][2]
    • Tommy Andreasen has stated, "Foreign customs are often hard to grasp. It’s clearly a love thing."[3] When asked if there was a ceremony associated with the promise, he stated, "I don’t know. If we ever decide and is relevant it will be in the show."[4]
    • In an "interview" written by Tommy Andreasen, Nya states that it is "pretty much an engagement".[5]
  • It seems to be equated with betrothal, as when Murtessa asks if Jay is betrothed, Nya says "Yes! He is! To me!"[6]
    • However, it is also treated similarly to a marriage proposal, such as in "Into the Breach" when Kai asks Jay "Did you pop the question yet?", which means to propose.


Promotional media

In Ninjago: Masters of Spinjitzu



Main events

War of the Oni and the Dragons · Battle of Nine Days · Stone Wars · Reign of Aspheera · The Devourer's bite · Long Winter · Serpentine War · Battle for All of Time · Battle between brothers · Search for the Golden Weapons · Attack of the Great Devourer · The Final Battle · Nindroid crisis · Second Serpentine War · Battle of Stiix · Fall of Ninjago · Rise of Ninjago · Oni's invasion · Siege at the Monastery · Lloyd's Journey · Liberation of the Never-Realm · Attack by Unagami · Battle for Shintaro Mountain · Conflict on the Island of the Keepers · Kalmaar's assault on Ninjago City


Ninjaball Run · Ninjago Talent · Tournament of Elements (Thunderblade) · Street Race of Snake Jaguar · Puppy-petting competition · Terra Technica Dance-Off · Speedway Five-Billion · Slug race


Slither Pit · New Year Festival · Day of the Departed · Dragon Day · Yin-Yang promise · Turnip Festival · The Choosing


Trial-By-Mino · Trial By Sphinx


Alternate timeline · Yin-Yang Eclipse