The manga series 'Gleipnir' by Sun Takeda began serialization, introducing the story that would later be adapted into a TV show.
It was officially announced that 'Gleipnir' would be adapted into an anime TV series.
The first episode of the 'Gleipnir' anime aired in Japan, bringing the manga series to television audiences.
The first season of the 'Gleipnir' anime finished airing its final episode.