"When the disaster will strike, a hero will arrive and together with his two friends aswell as other allies he will put an end to it."

Young boy suddenly finds himself floating in an unfamiliar space together with his two childhood friends. He then hears a feminine voice speak, asking them to save the world and become "the hero", after which he and his two friends are sent to another world. But... What world? What hero? What does it all have to with them three ? Why the mysteries ?

"Huh, guess since there is nothing better to do right now, We might aswell uncover those secrets, no?"