Takafumi Shimura is a minor character in Forbidden Siren, although he doesn't appear in the game, he appears in the 4th of the Strange Tales of Hanuda as well as in Siren: ReBIRTH.
Story[]
He is Akira Shimura's cousin, he was aware of the nature of Hisako Yao and the cult, as well as his cousin Akira Shimura. But contrary to Akira, who prefered to be silent and keep away from that, Takafumi instead was more active trying to reveal the secret behind Hanuda, even influenciating Akira's son, Koichi Shimura to intervene in the ritual from 1976 helping Miyako Kajiro escape and thus causing the landslide that took Akira's wife and son's life.
Takafumi was seen as crazy and kept locked in the Miyata Clinic, but escaped and hid in a hut nearby. There he had visions about what happened to Miyako and Koichi. However, Takafumi started to convert into a shibito and later was captured and locked inside the secret rooms within the Miyata clinic.