Gaku Mashio, grieving his father and recently suspended, suddenly finds himself transported 22 years into the past. There, he meets his own father, Harumi, as a peer in a town infamous for its delinquents.

Gaku Mashio's life takes an unexpected turn after his father's sudden death, compounded by his school suspension. Honoring his father's memory by the shore, a fall into the sea sends him 22 years into the past.
He emerges in Kurei, a town brimming with delinquents, where his same-aged father, Harumi, saves him. Now Gaku Miyagi attends Seiha High, ready to fight alongside his father to dominate the town.

Gaku Mashio time travels 22 years to a delinquent-ridden Kurei, where he teams with his same-aged father, Harumi, in Nine Peaks.

Nine Peaks, Gaku Mashio, Harumi, time travel, delinquents, action, shonen, Kurei, Seiha High School, read manga online