Jibun no Koto wo Shujinkou dato Shinjite Yamanai Fumidai ga, Shujinkou wo Fumidai dato Kanchigai shite, Yuushou Shiteshimau Ohanashi desu @comic

A Story of a Cannon Fodder Who Firmly Believed He Was the Protagonist, Misunderstood the Actual Protagonist as the Cannon Fodder, and Ended Up Victorious