Tsuuhan de Katta Youtou ga Gachi datta: Tameshigiri Shitara Kuukan ga Sakete Isekai ni Tobasareta Ageku, Densetsu no Yuusha da to Kanchigai Sarete Komatteimasu

Synopsis:

University pupil Souji Miyamoto finds himself unexpectedly transferred to a different realm after carelessly testing a replica sword he impulsively purchased. He arrives right in the midst of a summoning ceremony for a hero in a certain kingdom, leading others to confuse him for the genuine Hero. In an unusual twist, the princess realizes his true identity as a phony. Leveraging the knowledge that should his true nature be revealed, he would face execution, Souji is compelled to embark on a quest to conquer the Demon King. Yet, every individual in the Hero's team proves to be quite peculiar—each possessing their own unique challenges…! ?