●Story The main character “Keiichi Tsujisawa,” a second-year high school student attending a local school, and his twin sister “Akane Tsujisawa. One day, the younger sister Akane disappears after a line message of “Flip phone, video”. Soon after, a girl jumps off the roof of the school. The protagonist heads to the school to find out the truth. A mysterious video is left behind on her flip phone, and the incident from 25 years ago comes back to life. She is told that if she doesn't find the location of the video, she will die. Fear, a curse, and a horrifying truth are gradually revealed... ●System This title is a first-person horror adventure game. The story unfolds mainly through line messages on smartphones. Just like real time, the in-game time is also ticking away, and messages arrive in real time. And new incidents are triggered. The player must use mysterious videos and messages as clues to unravel the mystery of the incidents. ●Characters Keiichi Tsujisawa　the main character　　　　　　　　High school sophomore Akane Tsujisawa　twin sister　　　　　　　　　　　　High school sophomore Aya Sawakita　　 the main character's girlfriend　　　High school sophomore Yuji Akahori　　　Classmate　　　　　　　　　　　　High school sophomore Kota KAWABE　　Classmate　　　　　　　　　　　　High school sophomore Reina NARUMI　　Classmate　　　　　　　　　　　　High school sophomore Shigezo Gonda　　janitor Chizuko Gion　　　the master of the curse　　　　　a student at the school 25 years ago Others　　　　　Aya Sawakita's mother, Chizuko Gion's classmate