With this world full of uncertainty and hidden secrets, a young man named Kimura Sora vowed to get revenge on the guy who had mercilessly killed his parents with his own hands.

But what would he do after knowing the secret hidden in this world? Would he continue to get vengeance or discard it after knowing who and what his enemy is?

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Author note.

1. This is my first time writing. I'm also still a bit inexperienced and may make grammatical errors. So I would like to have your patience.

2. The story is a mash-up of high school of the Dead and the demon slayer after its 100 years time skip.

3. This wouldn't follow any plots that occur in the series. This would have a different storyline than highschool of the Dead.

4. This would be a harem, but I make sure not to ruin the story, and they would have a plot for their relationship. So the storyline may be a slow pace.

5. Disclaimer: I don't own the characters except for the OC. I also altered some of the character's personalities in the high school of the Dead.

6. I promised to bring you a fanfic with a story, not a fanfic full of fan service.