He has medium/short green hair with a little hank in the middle. Hideki also wears glasses, but he looks from the top of them. He wears Tendo Senior High School uniform.
Hideki is an occult lover and a tad introverted. He's physically weak, but highly introspective and has great insight. Overly sarcastic and ever the cynic, Hideki has a difficult time keeping friends. He considers himself lucky to have met Masayuki Hayashi. Their story begins when Hideki told Masayuki that ghost story...and they got wrapped up into something sinister.