He has black hair with a blue tint in them. They are styled to cover one of his eyes, which are grey. He wears Tendo Senior High School male uniform.
Hideki is in the same class as Kaori and serves as the student council president. His grades are top-notch and he is highly respected among his peers. Along with Kaori, he facilitates most of the school's functions. He was close friends with one of the students, Sanae Makiyoshi, who went missing. Due to hearing many ghost stories from that person, he is somewhat familiar with the occult. Despite this, he has never witnessed any strange phenomenons and doesn't believe in the occult. He remains a realist at his core.
Hideki, Masayuki, Kaori and Shiho stays at their school for a bit longer, wondering where did Yuuya and Kyosuke dissapeared as both of them went missing 3 days ago. They left the classroom and Kaori told the others a scary story. Suddenly an earthquake started and they all fell though the floor.
Hideki and Masayuki woke up in the hallway of the haunted school and saw a crack on the floor. Soon after they were found by the two sisters. They all go to find the other way and find the entrance but on the door it says that if they leave they will starve to death so they all stay in the school. Thy all notice a loose board and they take it. Soon after they use it to make a bridge across the gap. end up finding a corpse. While walking into the newly found place they find a corpse, who talks with them. He tells them about how the school is controlled by the evil spirit and how they can't leave. They all get scared and leave. Right after they leave the classroom another earthquake happens, cracking the floor beneath them and almost killing Shiho. Masayuki saves her and they find out that they are split into two groups, so they end up looking for the way to reunite.
Significant plot details end here.
Hideki's fate is left unknown as the game wasn't finished.