Other name: Rasubosu no mukō-gawa ~ saikyō no ura bosu = jashin ni tensei shitakedo, 1000-nen dare mo kona ikara gakuen ni kayou koto ni shita ~; The Other Side Beyond the Last Boss (LN); The Other Side of the Last Boss~The Strongest Hidden Boss=He Reincarnates into an Evil God, But Since No One has Come After 1,000 Years, He Decides to Go to School~; ラスボスの向こう側 (LN); ラスボスの向こう側～最強の裏ボス＝邪神に転生したけど、１０００年誰も来ないから学園に通うことにした～
Genre: Action, Adventure, Comedy, Ecchi, Fantasy, Harem, Mature, Romance, School Life, Shounen, Slice of Life
Date released: 2016
Author: Amane Noir
Translator: Uncommitted Translations
The short life of a 16-year old boy, who had a love of observation, ended after an accident, after which God appeared. The boy was a perfect candidate for a certain reincarnation, so he was asked if he wouldn’t mind doing so. The boy gave his consent, then reincarnated into another world. He reincarnated into the Evil God Ashtal. Just like in a game, once someone defeated the Last Boss, the Demon King, they would then be met with a bonus adversary, the overwhelmingly powerful Hidden Boss.
He spent 1,000 years observing the world through his magic.
Hey! Why hasn’t anyone made it here yet?! I’m supposed to be the Hidden Boss!
Finally, Ashtal became bored out of his mind; and after a certain incident, he decided to attend school. Sometimes he has to beat down a demon that gets carried away with itself, and sometimes he has to become a bank president to counterattack a great nation that got carried away with itself. This is that kind of Evil God story.
(I took this description from joeglens, I hope you won’t mind)