牧離, a seemingly ordinary individual, suddenly discovers the truth about the world—a world filled with knights battling each other, the appearance of Ultraman and monsters, mecha and monster brawls, and even fairy tales coming to life. His friends are understandably skeptical, questioning if his "middle-two disease" has relapsed. But this time, it's real. With the help of a mischievous system, 牧離 embarks on a genuine quest to save the world, facing fantastical challenges and perhaps, finding love along the way.