Kalafina will release a single, titled "into the world / Marchen", on April 5.

This will be Kalafina's first double A-side single. One of the title tracks "into the world" is the ending theme for NHK Sogou's historical program "Rekishi Hiwa Historia", while "Marchen" is being used as the ending theme for OVA's "Kubikiri Cycle: Aoiro Savant to Zaregototsukai". 

The single will be released in five different types: Regular Edition, Limited Edition A, Limited Edition B, Anime Edition, and Analog Edition. The Anime Edition will come with a DVD including the PV for "Marchen" as well as the ending footage for "Kubikiri Cycle: Aoiro Savant to Zaregototsukai". 

Source & Image: natalie