Kunimitsu Shidō is a twenty-year-old light novel author and college student who works with the same publisher as Masamune Izumi. He is a cheerful and outgoing young man with a well-groomed appearance and a friendly demeanor that makes him easy to approach. His writing career is built around a distinctive theme of sweets and desserts, which he also enjoys creating in real life as an accomplished amateur pastry chef. This focus led many of his early readers to mistakenly assume he was a female author. His breakout work, Silver Bullet, achieved impressive sales of over one million copies, cementing his reputation as a promising talent.

On the surface, Kunimitsu presents himself with exaggerated self-confidence and frequently calls himself the god of light novels, a boast that reflects his immense pride in his craft. Beneath that flamboyant exterior, however, lies a more fragile side. As deadlines draw near, he transforms from an arrogant showman into a hollow, exhausted figure, an almost ashen shell of himself, revealing the intense psychological toll of commercial writing. This duality captures the agony and obsession that accompany his creative process. He is also deeply shy around his editor, Kagurazaka Ayame, for whom he harbors a romantic crush, and he becomes flustered whenever she is near.

His role within the story is that of a supportive rival and occasional comic relief. He is introduced during the light novel competition arc where he faces off against Masamune and the prodigy Senju Muramasa, ultimately placing third and still securing a publication deal. Through his interactions with Masamune, he acts as both a competitor and a comrade, sharing the struggles of a professional writer and offering a window into the industry's pressures. Socially, he enjoys the company of fellow authors and sometimes joins group outings, though his terrible tolerance for alcohol leads to embarrassing incidents, and one infamous party with young children leaves him with an awkward and lasting fascination that becomes a recurring gag.

Kunimitsu’s abilities extend beyond his writing. He is an enthusiastic and skilled baker who delights friends with his homemade treats. Despite the turmoil he endures before a manuscript is due, he consistently delivers work that meets or exceeds expectations, a testament to his disciplined bursts of creativity. His charm and approachable nature help him navigate the competitive world of publishing while maintaining genuine friendships.