Tamako's older brother who's really into natural food science—basically the complete opposite of his sister when it comes to how they think about food. While Tamako's all about industrial agriculture and efficiency, he's the type to avoid additives and artificial stuff whenever possible. His whole thing is keeping food natural and pure, which honestly puts them at odds pretty often. He's genuinely passionate about it, not just casually interested, so it shapes how he approaches pretty much everything food-related.
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