A Certain Super Piledriver's Infinite War Chronicles

Because of mistakes I made when I was young, I rewrote this book. But I couldn't bear to delete my first attempt at writing, so I just added a "dark history" label to the volume title.

Worlds currently planned: Armed Librarians -- Gantz -- Senki Zessho (heavily modified version) -- an original world I wanted to write as a novel but never managed to -- ?