Yefu

is an ST: in. He resides in ST: in the ST:.

Biography
ST: lives in a house in the southwest portion of ST:. When ST: visits the village for the first time, he is tasked by ST:, the ST: chief, to pair up all of the NaN Anoukis in order to put together a village watch for all the monsters that have begun to appear after the NaN Spirit Tracks (Object)s vanished. ST: comments to ST: that his partner must be agile in the field, so he would prefer a pertner without big, flashy horns. As such, ST: ends up pairing him with ST:, the village chief himself.

Trivia

 * ST: humorously claims that because he and the other NaN Anoukis are forming "Elite Teams", he has taken on the code name "Agent Yellow".