Tenrai-sama to Ningen no Heso: Hirako Waka Shoki SakuhinshūLord Thunder and the Human Navel: Waka Hiroko's Early Works Collection; Lord Thunder and the Human Navel; 天雷様と人間のへそ―平庫ワカ初期作品集―; 天雷様と人間のへそ; 天雷神与人之脐