Ultramarine Magmell is a Chinese manhua series written and illustrated by Dainenbyo (Chinese: 第年ç§Â/DìniánmiÃÂo). A Japanese anime television series adaptation by Studio Signpost (formerly known as Pierrot+) aired from April 7 to June 30, 2019.
Dainenbyo launched the manhua on Fanfan Dongman's Fan Manhua website. Later the series was licensed and translated in Japan on Shueisha's shà Ânen manga app Shà Ânen Jump+ in June 2015 under the name Gunjà  no Magmell. Eight volumes have been published to date.
An anime television series adaptation was announced on April 29, 2018. The series is directed by Hayato Date and written by Chà «ji Mikasano, with animation by Pierrot+. The series' music is composed by Yasuharu Takanashi. It aired from April 7 to June 30, 2019 on Tokyo MX and BS Fuji. Fudanjuku performed the series' opening theme song "Dash&Daaash!!", while A Flood of Circle performed the ending theme song "The Key". Netflix streamed the series on October 10, 2019.
The name Magmell likely comes from Mag Mell, one of the names for the Celtic Otherworld.