The game is split up into five cases. The game has two gameplay modes, investigation sequences where the player controls Kyon and must navigate collecting clues and information, and trial scenes where the player controls Haruhi.

Like the previous games, Haruhi, Emiri, Ms. Mori, return to reprise their respective roles of defense attorney, prosecutor, and judge, the game introduces yet another foe, Mr. Arakawa, who in this game parodies Godot from the Ace Attorney series, complete with visor and coffee addiction.

Aside from Mr. Arakawa, the game introduces three more characters exclusive to this game, those being Taniguchi, the Vocaloid Hatsune Miku, and Asakura. The overarching story is about attempts on several sudent's lives, and the remergance of Ryoko Asakura.

[From Haruhi Wiki]