Top 6 in Top 11 best epic anime similar to Overlord you must watch.
Gate epic anime trailer
Youji Itami, an Otaku was on his way to a doujin conference in Ginza with a JSDF (Japan Self-Defense Force) officer when suddenly a mysterious gate opened in the middle of the city and some supernatural beings, the Knights appear through it by destroying things in different ways. With his basic knowledge, Youji saved as many people as he could while the JSDF stopped this strange invasion. After three months, Youji is assigned to lead a special team through the portal to find out the true purpose of the unknown world and negotiate with them to maintain peace between the two worlds.
In many cases, the epic anime Gate resembles Overlord, but there are differences. Gate is not too gloomy like Overlord, but both have good pacing and action, including strong elements such as creating allies, politics of dealing with powerful opponents. Besides, Gate also has Good quality animation. It may not be as good as Overlord, but it is well worth the experience.