Transfer student Buntaro Mori starts his first day at his new school already on the administration’s radar. He’s withdrawn and sullen, and the teachers are just waiting for him to explode. When his annoying classmate Miyamoto promises to leave him alone forever if he climbs to the top of the school, Mori eagerly takes up the challenge and shocks everyone when he makes it all the way to the roof. Flushed with the victory of his first successful climb, Mori can’t resist the lure of the local peak, despite warnings from more experienced climbers about the risks of climbing alone. But Mori doesn’t care. A little danger is nothing in the face of his new obsession. (Source: VIZ Media)

This is a story set in the dangerous Sengoku period, featuring the famous historical figure of Takeda Harunobu, later called Shingen. When he was fifteen, he accompanied his father to the Battle of Un no Kuchi, where he won his first victory as his father retreated. After that, his relationship with his father, Takeda Nobutora, changed. He heard rumors that his father wanted to give his inheritance to Harunobu's younger brother. Soon, Harunobu became certain that he must do something about his father...

The Onin War brought on a storm of turmoil that engulfed Japan. It was the Warring States period, a time in which no shogun was able to predict what the next day would bring. One young soldier of Kai stands tall. His eyes are set on the world.