Onsa Amano, a spirited 16-year-old at Okanoue Girls' High School, embodies a wild-hearted, tomboyish demeanor. Her family’s used bike shop, where she helps keep the wheels turning, fuels both her mechanical savvy and quiet frustration over its rumored shady dealings. This environment honed her knack for ingenuity, evident in her prized Yamaha SEROW225W—a bike she rebuilt from salvaged scraps of two wrecked machines.

A staunch Yamaha loyalist, she defends the brand with fiery passion, sparking heated debates with peers who champion rivals. These clashes highlight her bold, outspoken nature. Family anchors her world: she’s fiercely protective of her two younger brothers and shares a tight-knit bond with her father, the shop’s gruff but warm-hearted owner.

As a motorcycle club stalwart, she thrives on road trips and school events, flaunting her technical prowess. A spin-off manga spotlights her resourcefulness, depicting how she MacGyvers solutions to keep bikes running, a testament to her scrappy upbringing. Behind her grease-streaked exterior lies a love for old black-and-white films, a quiet contrast to her rugged persona. Standing 155 cm with an athletic 76-55-83 cm frame, her April 2 birthday and blood type A round out a character shaped by family grit, mechanical grit, and the roar of engines.