Frightened token removal with no challenge number

Regarding Shiho Takuya's Awe ability: If a model receives a frightened token automatically due to an effect or ability and thus never failed a test with an associated Challenge Number, how and when is the frightened token removed? Is it during the end phase and also automatic, or is a test required and if so, against what Challenge Number?

The model does not need to retake the test as no test was ever made, and therefore no Challenge Number has been set. All Frightened markers acquired in this way are removed in the End Phase.

Quoted from here: http://bushidothegame.wikidot.com/wiki:frightened

By Mcgreag

Excellent, thanks :)
By Ceders