Shuttling Between the Two Worlds

A monotonous day for the many had started, but no one had expected this to happen. Cracks appeared on the skies; lifeforms who came out of it can flip the heaven and earth in one hand. At the same time, many ancient heritages such as the Mage Towers, the ancient sects, and the demon killing exorcists appeared?! Lugh Austere Bayer is just a normal student that got caught up in all of this, that is, before he got a mysterious thing called [Panel]. Thanks to it, he learned many things that he shouldn't. Regressor, his harem members with monstrous potential, the calamity that is approaching the world, and so on. What the heck? Can I just go back to my usual life?! Watch Lugh as he gains the power to survive and protect his loved ones in this upcoming calamity through [World Travel]. -------------- Note: As it is my very first time writing, please do expect that I might make some newbie mistakes. Reviews are greatly appreciated! Writing sched: 1 chapter/ 2 days Cover art not Mine! Source: https://wallpaperaccess.com/student-anime