Danganronpa Togami

Living as the heir to the Togami Conglomerate, Byakuya Togami is suddenly attacked while on a trip to Prague with his biographer, a fellow student at Hope's Peak Academy referred to as "Blue Ink". Having his identity (and clothes) stolen from him, Byakuya listens as the imposter announces on live broadcast that, should he not be killed in 24 hours, he will take over the world. As the world descends into chaos with the propagation of the mysterious "Despair Book", it's up to Byakuya and Blue Ink to escape assassins and uncover the truth.

(Source: TV Tropes)