Based on a specially drawn illustration, Umi Asanagi stands in a lively pose wearing her school blazer with a neatly tied ribbon, her healthy figure captured with the graceful movement of her skirt and flowing hair. Her iconic hair highlights are recreated with delicate gradient painting to achieve translucent effects. A mischievous, teasing smile plays on her lips as she gazes forward, inviting a closer look. Intricate details such as the B-movie DVD and a profile sheet peeking out from her school bag add a sense of story and mystery. The base and silhouette convey her youthful energy, while the soft shading and reflective highlights bring depth and life to every angle.

Umi Asanagi is presented as the secret friend who no one in class knows about, a charming contrast to the everyday school life. In the series I Made Friends with the Second Prettiest Girl in My Class, she forms a special bond with the protagonist through playful mischief and quiet moments of solidarity. This figure captures her coy, mischievous nature and the depth of her character—an ally who observes from the sidelines yet injects warmth and intrigue into daily routines. The Special Set's 'Winking Face' option emphasizes her playful mood, while the original B2 tapestry hints at a larger world beyond the classroom and the pages of a photo or DVD.