Super Cub is a motorcycle produced by Honda in the middle of the last century. It is fuel-efficient, durable and has a very good reputation. Honda has become world-famous. The protagonist of this film is a teenager who drives a super cub through the streets and alleys to deliver takeout. Takeshi Hamada (played by Keita Saito) is nicknamed "Hammer" and is a famous speedster. Takeshi's parents live overseas and he lives alone in Japan. He doesn't go to school well, but is obsessed with thrilling motorcycle competitions. The money his parents give him is used to equip his car. The childhood sweetheart Mio (Kana Kurashina) is very angry at such Takeshi, but Takeshi still goes his own way. On this day, Takeshi and his equally matched opponent Shinji (played by Fuki Ochiai) started another contest. A white motorcycle suddenly broke in-this is the female police officer Reika (played by Nagasawa Nao). Takeshi and Shinji were taken to the police station for investigation. It turned out that Nojima and others who often raced together were criminals. After leaving the police station, Takeshi's carefree days came to an end. He moved into "Kidaya", a fried noodle shop opened by his father's friend, Mio's father, and went to school while working part-time to pay off his debts. Takeshi found a dilapidated motorcycle in the garage of "Kidaya" - Honda Super Cub. He repaired the car according to the manual. On this day, the old customer of the store, the Civic Center, ordered takeout, but because there was an order from the Civic Center, the store could not arrange staff, so the manager had to let Takeshi ride a motorcycle to deliver the goods in an emergency. From then on, Takeshi became a takeout deliveryman. He rode the Super Cub to speed through the streets and alleys, and soon became a celebrity in this neighborhood. The deliverymen of nearby pizza shops were not as fast as him. There were continuous motorcycle thefts in the jurisdiction of the 17th Branch Office where Lihua was located. She conducted a separate investigation and found that the incident was related to Shinji. And Takeshi is also involved. For the sake of his friends, he must drive a 90CC delivery motorcycle Super Cub to start a racing showdown...