Music
The first opening theme song is "Redo", performed by Konomi Suzuki, and the first ending theme is "Styx Helix", performed by Myth & Roid,[47] while for episode 7 the ending theme is "Straight Bet", also performed by Myth & Roid.[48] The second opening theme song, titled "Paradisus-Paradoxum", is performed by Myth & Roid, while the second ending theme, "Stay Alive", is performed by Rie Takahashi.[49] Myth & Roid also performed the ending theme for episode 14 titled "theater D".[50]
The second season's first opening theme song is "Realize", performed by Konomi Suzuki, while the first ending theme song is "Memento", performed by Nonoc.[51] The second season's second opening theme song is "Long Shot", performed by Mayu Maeshima, while the second ending theme song is "Believe in You", performed by Nonoc.[52]
The third season's opening theme song is "Reweave", performed by Konomi Suzuki, while the ending theme song is "Nox Lux", performed by Myth & Roid.[33]
The fourth season's opening theme song is "Recollect", performed by Konomi Suzuki and Ashnikko, while the ending theme song is "Ender Ember", performed by Myth & Roid and TK from Ling Tosite Sigure.[53][54]
The series' soundtrack was released on CD on 26 October 2016. The disk contains 21 tracks composed by Kenichiro Suehiro.[55]
"Redo", Suzuki's 10th single, was released on CD on 11 May 2016.[56] The single was also released as a limited edition with a DVD featuring a music video, a live concert video, and a "making of" video.[57] The songs were performed by Suzuki, with lyrics by Genki Mizuno and arrangement by Makoto Miyazaki.[58]
The CD for "Styx Helix", the series' first ending theme, was Myth & Roid's 3rd single. Written, arranged, and performed by the group, it was released on 25 May 2016 and included both regular and instrumental versions of "Styx Helix" and "Straight Bet".[59][60]
"Stay Alive", the second ending theme, was released as a single on 24 August 2016. The songs were performed by Takahashi (Emilia) and Minase (Rem). The songs were written and arranged by Heart's Cry.[61]
Myth & Roid released the second opening theme as a single on 24 August 2016. The CD included regular and instrumental versions of "Paradisus-Paradoxum" and "Theater D".[62]
For Memory Snow, three pieces of theme music were used: the ending theme "Memory Memory Snow" and the image song "Relive" by Nonoc, and the insert song "Memories" by Riko Azuna.[63]
