Skeptic

The protagonist Akira Fudo learns from his best friend, Ryo Asuka, that an ancient race of demons has returned to take back the world from humans. Ryo tells Akira that the only way to defeat the demons is to incorporate their supernatural powers, and suggests that he unite with a demon himself.

One morning, as office worker Kobayashi gets ready for another day at work, she is greeted by a terrifying sight—the head of a large dragon staring into her eyes from across the balcony. The dragon immediately transforms into a cute, busty and energetic young girl in a maid outfit, who introduces herself as Tohru.

Naofumi Iwatani was summoned into a parallel world along with three other people to become the world's Heroes. Each of the heroes were respectively equipped with their own legendary equipment when summoned.