[Comprehensive] For the sake of all mankind, I have to...

Combination of main disasters + bullets, the content of bullets is not much, and the main characters may not appear on the stage.Accidental brainstorming, no drafts, just write when you get the chance. ------------------------------------------ The heroine Hoshino Saki experienced Enoshima Shield After the [biggest, worst, and most desperate] event in human history caused by the child, I went back in time to the day I graduated from junior high school.After entering PK Middle School, a series of interesting "campus daily life" happened with Saiki Kusuo and others, probably.