Shuichi Kagaya is the main protagonist of the anime and manga series 'Gleipnir.' He is a high school student who mysteriously gains the ability to transform into a large, cartoonish mascot costume with powerful abilities. Despite his gentle and reserved nature, Shuichi is thrust into a violent world full of people with supernatural powers. Throughout the series, he struggles with his new identity, forms an alliance with Claire Aoki, and searches for the truth behind his transformation and the strange coins that grant others similar abilities.