A fifth grader stumbles into her basement and finds out she's supposed to fight an actual evil organization because her bloodline demands it. The show commits completely to the absurdity: these are kids with homework and crushes trying to live up to impossible ancestor expectations, and they're terrible at both. It's comedy that lands because the tone never breaks, romance that matters because the stakes are grounded in real friendship, and action that breathes because nobody's pretending this is anything other than what it is.
Isami Hanaoka is an ordinary fifth grader with an extraordinary inheritance. When she stumbles upon mysterious artifacts hidden in her family home, she uncovers the truth: she's descended from the legendary Shinsengumi warriors. Along with her classmates Soushi and Toshi, who share the same bloodline, Isami realizes her ancestors left behind more than just relics. They left a mission. The three young descendants must band together to confront the Kurotengu organization, a shadowy group threatening their world. Armed with ancient weapons and inherited techniques they're still learning to control, they transform from ordinary students into unlikely warriors. Their battles blend comedy with genuine danger as they juggle homework, friendships, and the weight of honoring their ancestors' legacy. The show balances action-packed confrontations with lighthearted school life, creating moments where the absurdity of middle schoolers fighting supernatural enemies becomes part of the charm. Romantic tension simmers beneath the surface as the three protagonists grow closer through their shared trials. It's a story about discovering your purpose, trusting your friends, and rising to challenges you never expected to face.