Ichirō Mamiya (間宮 一郎 Mamiya Ichirō) is a famous painter who disappeared in his mansion 30 years prior to the events of Sweet Home. His disappearance is believed to be connected to his wife's suicide. He painted 24 frescoes throughout his home, which can be photographed by Taro to reveal hints and bits of story.
The five protagonists went to his mansion intending to make a documentary about him and his art.
- It is suggested by the game that Yamamura is, in fact, Ichirō Mamiya.