|Title||Principal Eiji Nagoshi|
|Voiced by||Tatsu Kaneko|
Eiji Nagoshi (名越 栄治 Nagoshi Eiji?) is a minor antagonist in Forbidden Siren. The principal of Hanuda's elementary school, he became a shibito on the first day of the town being sent into another dimension. He is only seen as a shibito, never a human in-game. He acts as an antagonist towards Reiko Takato, Harumi Yomoda and Naoko Mihama.
During Day 1, Eiji was at some point killed and resurrected as a shibito due to the red water in his system.Principal Nagoshi roamed the school grounds while Mrs Takato and student Harumi move through the area. Eiji made himself known when he encountered Reiko in the gymnasium after she found a crowbar to remove wooden planks from a window to escape. Having locked the gymnasium doors, he had the keys with him, but Reiko was able to incapacitate the undead principal in order to get the keys and escape the gym. Getting up moments later, he got involved with Reiko and Harumi along with the other shibito, but is ultimately unable to stop them from leaving the school.
In the coming hours, Principal Nagoshi evolved into a Shibito Brain, granting him the ability to take a hold of the connections with other shibito around him. Still in the school, his only company were the Spider Shibito, who proceeded to web sections of the school to serve as a nest for them. Naoko Mihama, a TV presenter from outside Hanuda looking to film for a TV documentary, entered the school thanks to Reiko opening the fire exit. She encountered Shibito Brain Eiji, who was soundly defeated, leaving to Spider Shibito blacking out until his reawakening. Naoko got away from the principal and the school from an exit door underneath the first floor stairs.
Principal Nagoshi is seen for the final time in the Nest after Datatsushi's defeat. As the Nest collapsed, Eiji attempted to harm Harumi, only to be grabbed by a fellow Shibito Brain, Reiko. She attacked Eiji once more, and the instability of the Nest lead the two brains falling into a pit while Harumi fainted, who was fortunately able to make it back to the real world. It is presumed that Nagoshi was destroyed during Kyoya Suda's killing spree.
- His role from when he tries to attack Harumi near the end of the game was used as partial influence for Sol Jackson in the game's reimagining, Siren: Blood Curse.