Rintarō Tatewaki is a main character and third-year student at Hoshigei High School, serving on the festival committee. Initially focused on sculpting, he later shifted his passion to baking. His artistic foundation stems from deep respect for his grandfather, a master sculptor.

He is a short-statured young man with sharp, short curly orange hair and blue eyes. Despite his small frame, he wields tools like chainsaws and chisels to create large-scale sculptures, demonstrating significant physical strength.

Bright, cheerful, and the most energetic member of his group, Rintarō possesses a strong desire to bring happiness to others. He channels this through his hobby of making sweets for classmates and committee members, approaching his commitments with detail-oriented responsibility and dedication. His sparkles manifest as colorful, vanilla-scented bubbles.

Key relationships define his experiences. He persistently creates healthy carrot-based sweets for his younger cousin, Monet Tsukushi, motivated by concern for Monet's well-being despite repeated rejections. Kohana Aigasaki profoundly impacts his path, helping him realize fulfillment exists beyond sculpting. Their interactions, especially in episode 13, lead him to understand multiple avenues exist and personal joy matters. He gifts her a small owl sculpture in episode 7, reflecting their connection.

His character development centers on a major vocational shift. Originally dedicated to sculpting out of familial admiration, his inclination to nurture others through food revealed a passion for baking. Kohana’s influence crystallized this transition, helping him recognize baking as his true calling. This evolution represents a change in artistic medium and a broader acceptance of multifaceted life paths, emphasizing self-driven choices aligned with bringing joy.

His birthdate is March 25, making his zodiac sign Aries. He stands 165 cm tall, weighs 52 kg, and has blood type O. His preferred activities center around creating confectionery for those around him.