“The Yin-Yang promise is a beautiful and sacred tradition, Jay. Congratulations.”
Dareth to Jay in "The Darkness Comes"

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 is not the Ninjago equivalent of a marriage proposal. It is 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]
  • It seems to be equated with betrothal, as when Murtessa asks if Jay is betrothed, Nya says "Yes! He is! To me!"[5]
    • 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 LEGO Ninjago: Masters of Spinjitzu




War of the Oni and the Dragons · Light vs. Darkness · Reign of Aspheera · Long Winter · Serpentine War · Battle for All of Time · Attack of the Great Devourer · The Final Battle · Nindroid crisis · Second Serpentine War · Battle of Stiix · Fall of Ninjago · Rise of Ninjago · Oni Invasion · Monastery Siege · Lloyd's Journey · Liberation of the Never-Realm · Attack from Prime Empire · Battle for Shintaro · Conflict on the Island of the Keepers


Ninjaball Run · Ninjago Talent · Tournament of Elements · Thunderblade · The Teeth · Puppy-petting competition · Terra Technica Dance-Off · Speedway Five-Billion


Slither Pit · New Year Festival · Day of the Departed · Dragon Day · Yin-Yang Promise · The Choosing · Trial-By-Mino


Alternate timeline · Yin-Yang Eclipse

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