This game is called Murder Mystery. The player becomes one of the characters in the story and searches for the culprit of the incident that occurs in the story. Since the criminal is also one of the players, the purpose is that the player who became the criminal does not know that he is the criminal.
Each player has his or her own purpose other than searching for the criminal or not knowing it, and each player aims to achieve multiple goals and win the points obtained by achieving them.
"Ricca To Haiiro No Tsukimisou -Ricca and Gray Cherry Blossoms-" is the first in a series of Murder mystery that seeks out the true criminal by clearing the suspicion of the girl detective "Ricca" who is always the suspect in the case.
Find out the truth about the fall and death of her students in Ricca's high school.
—description from the designer