School Days (a.k.a. School Death or SchuleTage) is a hentai series consisted by games (for PC & Playstation 2), anime, comic, novel, etc. Released by Overflow, a company located on an array of miserable isles floating on somewhere in northwestern corner of Pacific Ocean. Most of the audience just thought the entire series is a fictional work, actually, it is telling a ture story not happened in the universe we are living in, but in another parallel multiverse called 2-Dimensional universe, or a story based on that ture story. However the publisher made many, many many bad modification to the original plot, for more earning, seriously twisted the idea the author originally wanted to tell you.