Upon realizing, he found himself in an unknown world—a world where his past assumptions were useless.

The protagonist, Yusha, awakens in a completely different world, his last memory being of a hospital.

Despite possessing no apparent power, he is hailed as a savior by the people and reluctantly sets out to defeat the being known as the Demon Lord. However, his companions are slaughtered by the Demon Lord's subordinates.

When he resigned himself to death, the one who saved him was Touko, his childhood friend from his previous world.

While her appearance still held a resemblance, her essence had become something entirely different, possessing monstrous power. Yet, her spirit remained unchanged. Without a single alteration, she directed her full affection towards him.

Yusha, who was thrust into the role of a savior, somehow manages to dispel that misunderstanding and begins to dream of a slow life in another world, but...