Overview Onsen-san (Mr. Hot Spring, おんせん-さん) is a NPC that can be found in the Hot Spring House in the Wilderness. His appearance can only be seen by using Lamp effect because of the darkness of the house. He is sitting beside a hot spring pool and has a pipe from his head absorbing the spring water. [img]http://vignette2.wikia.nocookie.net/yumenikki/images/b/b4/Onsen-san.gif[/img] Interaction He only reacts to the Knife effect. Stabbing him will change the color of his head from red to blue.