Soushi Yukimi, a fifth-grade student at Oedo Elementary School, carries the bloodline of the legendary Shinsengumi through his descent from Okita Sōji—a heritage reflected in his family name. When he and classmates Isami Hanaoka and Toshi Tsukikage uncover ancestral relics in Isami’s basement, the trio forms a team to oppose the shadowy Kurotengu organization.

Soushi wields the Dragon Fangs, twin spiritual artifacts that merge into a radiant bow channeling energy arrows. Their activation depends on his Shinsengumi lineage, enabling precise ranged combat that complements Isami’s swordsmanship and Toshi’s acrobatic orb-assisted kicks.

Charmingly flirtatious, Soushi showers roses and poetic advances on female peers and adults alike, blending playful confidence with earnest romantic counsel. This lighthearted persona shifts seamlessly into battlefield focus, where he strategizes and supports allies against Kurotengu threats.

Though classmates Mayuko Kiyokawa and Izumi Maki harbor crushes he does not return, his dynamic with Isami and Toshi oscillates between rivalry and camaraderie, rooted in their shared legacy. Missions deepen their bond as Soushi balances his roguish charm with growing leadership instincts, guided by ancestral duty.

His parents, Eisuke and Orie Yukimi, remain peripheral to the conflict, leaving Soushi’s growth centered on friendships and reconciling his dual identity as a spirited prankster and guardian of history. Across all documented media, his journey culminates in unwavering resolve to defend his hometown, honoring the Shinsengumi’s enduring spirit without shedding his signature roses or wit.