Shirō Nishi, grandfather to Seiji Amasawa, runs a violin workshop and antique shop near Shizuku Tsukishima’s home. A warm, insightful mentor, he champions Seiji’s dream to study violin-making in Italy despite family objections. His cheerful wisdom guides younger characters, blending encouragement with practical insight into the rigors of artistic craftsmanship.

Decades earlier in Germany, he discovered a figurine called the Baron in a café, growing deeply devoted to it. His friend Louise, a romantic interest, helped him acquire the Baron while intending to secure its pair, the Baroness, after repairs. World War II severed their connection, leaving both statues and their bond unresolved. The Baron remains a cherished relic of his lost love, embodying unfinished history.

After Shizuku visits his shop, he shares the Baron and a restored grandfather clock illustrating a tragic tale between a dwarf king and fairy queen. Sensing her creative spark, he invites her to feature the Baron in her story, asking to read her manuscript first. When Shizuku doubts her draft, he comforts her with a geode metaphor, likening her unrefined talent to crystals needing time and effort to shine.

His mentorship—patient yet grounded—highlights perseverance, whether advising Seiji on craftsmanship or Shizuku on storytelling. Though his past with Louise lingers as a quiet echo of love and loss, he channels these experiences into nurturing others’ ambitions, emphasizing growth over regret. His outlook remains rooted in fostering potential, balancing empathy with honest reflection on art’s challenges.