'Seraph of the End,' or 'Owari no Serafu' is a popular dark fantasy anime series. It is originally a dark fantasy-themed manga called 'Owari no Serafu', written by Takaya Kagami and Daisuke Furuya and illustrated by Yamato Yamamoto. 'Seraph of the End,' or 'Owari no Serafu' manga was first published in 2012 on September 3.
Konosuba or Kono Subarashii Sekai ni Shukufuku o! in Japanese is a very popular and funny fantasy/Isekai/adventure anime. If you are moderately in touch with the modern anime community, you must have heard of this absolutely hilarious masterpiece.