Touhou History Eater is a single-player casual and arcade game in which players navigate a maze while enemies chase them, answering trivia questions under time pressure to gain temporary power-ups. In this game, the storyline revolves around Keine, who has been possessed by Yuyuko during her ghost practice, leading to an unstoppable appetite for history and folklore books, especially in the magical library Voile at the Scarlet Devil Mansion. It stands out with its blend of old-school arcade action, educational themes, and fast-paced gameplay, featuring chiptune remixes and a focus on trivia challenges that test players' knowledge of folklore and history while avoiding enemies.