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. 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. Here is a story expanding on the themes