Since taking on the mission to save the world, do you have any idea what my life is like every day?
World One: The Monsters Appear
At first, he was like this: "Big Sis is amazing!"
And then: "I want to protect Big Sis too!"
Later: "Big Sis really is amazing. Once I've killed all these despicable humans, will you marry me?"
???
World Two: The Apocalypse Arrives
At first, he was like this: "It's okay. I'll stay by your side."
Later: "It's okay. I'll stay by your side forever," he said in a world shrouded in white mist.
World Three: Reality and the Red Moon Fairy Tale
World Four: Who Killed Him?
World Five: Kill the Bride
The heroine is very strong, and the hero is pretty crazy.
Theme: The human heart can be terrifying, but it can also be the warmest thing of all.