Kotaro Shirai

is an aspiring writer, helping Kazuma and Shiori's mission by giving them hospitality. He loves to drink milk.
==History==
Kotaro Shirai is the younger bother of Haruka Kurihara and uncle of Amane Kurihara was a young man chasing the Kamen Rider urban legend on the internet. He quit his job from a publishing company and sought to become famous as a non-fiction writer.
While chasing the rumored Kamen Riders, he arrives at Kazuma Kenzaki's apartment and lets him live in his own house under th condition that he will be interview him for his story. After BOARD headquarters was destroyed, Shiori Hirose also moved in and the three began living a communal life.
In addition to interviewing, he also supports the Riders' battle by telling Kenzaki about the appearance of the Undead. Therefore, he was often involved in a dangerous situation, but he continued to support him without running away.
==Personality==
A light-hearted figure with a strong love for milk, Kotaro is an amiable fellow, if somewhat dim and unreliable. He cherishes his sister Haruka and niece Amane Kurihara very deeply, but is often bothered by Amane's misbehavior toward him. Evidently, Kotaro is very timid in nature, being afraid of cockroaches, mantis, thunder, and earthworms. 
Kotaro was initially hostile towards Hajime Aikawa, distrusting his shady nature. Upon learning of Hajime's nature as Undead, his hostility increased, afraid for his family's safety. In his encounter with Miyuki Yoshinaga, Kotaro found himself seduced by her charms despite her being an Undead. Kotaro's hostility appeared to deceased overtime, after growing to realize how much Hajime really was a good person.
==Behind the scenes==
===Portrayal===
Kotaro Shirai is played by .
==Notes==
To be added.
==Appearances==
==Navigation==
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