顔が味噌をつけたように斑で、平べったくて容姿が醜かったため

'The Nighthawk Star' (Yodaka no Hoshi) is a highly symbolic masterpiece of fairy tales written by Kenji Miyazawa during the Taisho period, depicting self-sacrifice and spiritual salvation. The nighthawk (Yodaka) had a flat, ugly face, mottled as if smeared with miso, and because of this, he was despised by other beautiful birds like the kingfisher and the hummingbird, who said, 'There is no bird as ugly as this,' leaving him to live in severe bullying and loneliness.