In that word is included the meaning of matching up to somebody's particular wavelength.

He took a step backward when he saw the snake.

When he came to know the whereabouts of the woman on New Years Day after seeing a letter delivered to Naka no kimi, Nioumiya made his vassal who was well informed about the internal situations of Kaoru's residence probe and finally came to know that the woman lives in Uji as Kaoru's mistress.