The Tale of how I was Reincarnated as a Hero but Decided I'd Help the Demon Lord Instead.

"It all happened so fast, too quick for the human eye to see."
Tokuma Jiroki a 16 year-old boy was just finishing the download of his newest Moe Magic Crystal rush, when all of sudden a bright light erupted in the sky. The next thing he knows he's summoned along with twelve other people from around the world, and told that the only way back is to slay the ever so cliché Demon Lord. But is it really worth returning?

Even if I've already finished the book, I'm more than open to critics in hopes of improving the reading experience and the book itself.

Thanks in advance.