You play as a young detective who works for the famous investigator Utsugi. Your first important assignment is to investigate a murder case where a girl named Yoko was found dead near a central bridge. As you start investigating, you hear rumors about a mysterious ghost-like "girl who stands at the back" from Yoko's school.
As you progress through the game, you'll need to use your wit and talents to solve the case. The gameplay is focused on investigation, where you have a menu with choices like Talk, Investigate, and Think. You can ask suspects various topics and gather clues by questioning people or examining areas. In certain places, you'll need to move a hand-like cursor over the screen and click on a precise spot to examine it more closely.