Shinobi No Ittoki (dub) Episode 5 -

It seems you are looking for a story inspired by of the English dub of Shinobi no Ittoki . In this episode, titled "Cycle of Fate," the tension between the Iga and Koga clans reaches a boiling point during the Ninja Academy exams.

"The Iga heir," Haruka sneered, spinning a kunai between his fingers. "A boy playing dress-up. Do you think that suit makes you a ninja? You’re just a relic of a dying clan." Shinobi no Ittoki (Dub) Episode 5

Haruka hit the ground, gasping for air. Ittoki stood over him, his breathing ragged. He had the opening. He could have ended the cycle right there. It seems you are looking for a story

Kousetsu watched from the trees, a flicker of something—perhaps hope—crossing her features. The cycle hadn't broken yet, but for one night, in the heart of a simulated forest, the wheel had stopped turning. "A boy playing dress-up

Kousetsu finally turned, her mask reflecting the dim light of the artificial moon. "It’s a cycle, Ittoki. A wheel that keeps turning. We are just the spokes."

Here is a story expanding on the themes of that episode, focusing on the weight of heritage and the "cycle" that traps these young ninjas. The Weight of the Blade

The air in the Koga training grounds was thick with the scent of ozone and damp earth. Ittoki Sakuraba stood at the edge of the simulated forest, his lungs burning. He wasn't just fighting his classmates anymore; he was fighting the shadow of a father he never truly knew and a future he never asked for.