星野九太郎
星野九太郎
Kyuutarou Hoshino

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Hachirota Hoshino&#039;s younger brother, he also displays a strong interest in space travel, and hence spends most of his time attempting to construct a working, miniature rocket, so as to prove his talent in that particular field.<br /> <br /> He maintains a shaky relationship with Hachirota, openly displaying disrespect for him. However he develops significantly throughout the series, especially after encountering Yuri Mihailokov.<br /><br />