When Shirou destroyed the Grail, he wasn't expecting it to grant his wish anyways by turning into a rocket and spiriting him away. In a new world, filled with monsters called Grimm and superheroes called Huntsmen, he's finally able to pursue his dream to become a hero! Of course, Grail-kun isn't going to make it easy for him. Semi-serious Carnival Phantasm crossover!

When an overzealous Shirou jumps into a fight that he cannot win, his story comes to an end. Or does it? Appearing in a new world that bears striking similarities to a video game – and with absolutely no idea how video games work – can Shirou fulfill his dreams of becoming a Hero? And will that goal be any easier to achieve now that a Legendary Bow is stuck to his left hand?

With no memories of anything besides his name and his skills, which seem to include a strange propensity for swords and a peculiar ability he only knows as magecraft, a boy wakes up in a cave with twelve others. Is the overwhelming desire to save others enough to survive in this new world?