Tengen Hero WarsTengen Eiyuu Taisen; テンゲン英雄大戦; Tengen Hero Wars

One day, the hero-adoring highschooler Oda Nobunaga, together with his sister stepped into a mysterious other world. There, were all the strongest and famous historical heroes and figures of the Warring Kingdom period. The curtain rises on the battle to decide who the strongest hero is, and who will be the ultimate ruler.