One of the "Sweets Princes" of the St. Marie's Academy who specializes in chocolate. Andou is his childhood friend and Hanabusa is his roommate. Kashino is sometimes teased or misjudged due to his height, for he is the shortest of the Sweets Princes. He comes from a prestigious family of doctors who do not approve of his career choice. Due to a condition that his family gave him to attend St. Marie, he is always at the top of his class. Kashino is generally unsociable, straightforward, easily angered, and prickly. He greatly admires his uncle (who is a chocolatier) and spent a lot of time in his shop when he was little (which inspired him to become a pâtissier). Even though he is hard on Ichigo's klutzy personality, he warms up to her to the point of being teammates and friends, and later falls in love with her.
In the second season, Kashino skipped a year in school because of his excellent grades during Team Ichigo's study abroad in Paris. He is 16, but still conscious about his height, as Johnny regularly teases him for it. Whenever he sees Johnny holding Ichigo, he becomes visibly jealous. At the end of the series, he asks Ichigo if she will stay with him forever.