When Shirou destroyed the Grail, he wasn't expecting it to grant his wish anyways by turning into a rocket and spiriting him away. Waking up in an unfamiliar world, filled with evil monsters called Grimm and superheroes called Huntsmen, will he finally be able to realize his dreams of becoming a hero and making cute girls happy? Semi-serious Carnival Phantasm crossover!

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?