The Guy Who Thought He Was the Hero Used the Real Hero as a Stepping Stone and Won

Jibun no Koto wo Shujinkou da to Shinjite Yamanai Fumidai ga, Shujinkou wo Fumidai da to Kanchigai Shite, Yuushou Shiteshimau Ohanashi desu

自分の事を主人公だと信じてやまない踏み台が、主人公を踏み台だと勘違いして、優勝してしまうお話です