In No Game No life, the borders of the characters and man objects are red lines. In Netoge no Yome wa Onnanoko ja Nai to Omotta, the borders of the characters and objects in the game world are blue. Almost all other anime have black lines around the characters and objects.

What is this phenomenon called?

No Game No Life:

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Netoge no Yome wa Onnanoko ja Nai to Omotta

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  • 6
    I'm guessing that it's just a stylistic choice and there's no specific name for it, but I'd be interested to know if there's actually an answer to this.
    – kuwaly
    Mar 3, 2018 at 17:16
  • I was hoping for it being a named stylistic choice so I could look for more of it. I think it's kind of cool. Mar 3, 2018 at 19:57
  • I remember for Nagi no Asukara (A Lull in the Sea), they decided to have the sea kids/people drawn with blue outlines due to... being sea people. I believe I read it out of the art book included with the premium Blu-ray box (I'll have to double-check), but the art book just said "drawn with a blue outline" or something to that effect, although obviously that's how it was translated into English. I would be interested if there was a particular name for this, but a big part of me thinks there isn't.
    – JaykeBird
    Mar 4, 2018 at 7:04

1 Answer 1


According to the book 『アニメーションの基礎知識大百科』(Encyclopedia of animation basics) by Kamimura Sachiko, the Japanese term for this is 「色トレス」(iro toresu, meaning "colored trace", see p.99). In some cases of iro toresu the borderline (trace) is given the same hue as the area it surrounds, making the borderline essentially invisible, and this is referred to as 「T.P同色」(T = trace, P = paint, and 同色 means "same color", see p.84). The examples you gave fall under the opposite term 「T.P別色」, meaning that the trace and the paint have different colors.

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