After being suddenly transported to another world, Subaru Natsuki and his new female partner are brutally murdered. However, Subaru awakens to a familiar scene, meeting the same girl again. The day begins to mysteriously repeat itself.

Ryôta Satô was reincarnated to another world, but he was burdened which his level is fixed to 1 in another world. Although he wasn't able to raise his level, he had a skill to create a cheat-like item that shouldn't exist from monsters.