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.
Shuichi discovers his ability to transform into a monster costume resembling a mascot, which hides his true form and grants him superhuman strength.
Shuichi encounters Claire, a mysterious girl searching for her missing sister, and the two form an uneasy alliance to uncover the truth behind the transformations.
Claire reveals that she can possess Shuichi when she enters the suit through a coin-shaped opening, establishing their unique cooperative combat strategy.
Shuichi and Claire fight against other monster costume wielders who are searching for a mysterious treasure, revealing the deadly stakes of their powers.
Shuichi and Claire begin unraveling the origin of their abilities and the secret government experiments connected to the transformations.
The true nature of the treasure that other transformed beings seek is revealed to be a key to immense power and knowledge.
Their partnership solidifies as they rely on each other to survive increasingly dangerous encounters.
Shuichi and Claire face off against agents trying to capture them for experimentation and control of the powers.
Details about Shuichi's mysterious past and the true capabilities of his transformation start to emerge.
