Bakusou Kyoudai Let's & Go Episode 13: Fully Cowled Racer of Public Attention! The 6th Fully-Cowled Machine Racer!

The episode opens by reminding us of Go Seiba's dedication, recalling a time when his Mini 4WD, Magnum, was confiscated. His teacher, Yanagi-sensei, challenged him to a race, an obstacle Go met with characteristic fervor. He navigated a makeshift track of school desks, ultimately reclaiming his machine with a clever move. This victory cemented his belief in his machine and his own resourcefulness, a belief now sorely tested by illness.

We find Go in bed, his face flushed with a high fever, Retsu and their Mom, Yoshie, hovering with concern. A temperature of 38.5 degrees threatens to sideline him from Dr. Tsuchiya's crucial race. Despite his illness, Go attempts to prove his fitness with desperate squats, a display of defiance quickly cut short by his failing strength. Retsu, ever the responsible older brother, offers to prepare Magnum, promising to support Go even if he cannot race.

As dusk falls, Retsu gazes out, pondering the challenge ahead and the data-gathering purpose of the race. A montage hints at his rivals, including Fujikichi and the new, unknown Jiro-maru, replacing Kurosawa. Simultaneously, Dr. Tsuchiya and the Mini 4WD Fighter finalize the complex endurance race, emphasizing its importance for future machine development. The stakes are clearly higher than mere bragging rights.

The next morning, Go awakens with a cunning plan, his resolve unbroken despite his lingering fever. He manipulates the thermometer with the refrigerator, aiming for a suspiciously low reading. His Mom, Yoshie, momentarily convinced, grants him permission to race. Retsu, however, observes his brother's triumphant cheer with a knowing, suspicious look, understanding Go's reckless determination.

On their walk to the Tsuchiya Laboratory, Go confesses his thermometer trick to Retsu, who, despite his annoyance, acknowledges Go's "guts." They arrive before the massive, high-tech facility, its grand scale awe-inspiring. This imposing structure underscores the significance of the race, confirming it as an event far beyond ordinary competition.

Fujikichi Mikuni makes a flamboyant entrance, his luxury limousine a stark contrast to the brothers' arrival. His immediate taunts ignite the familiar rivalry with Go. Soon after, Ryo Takaba and his younger brother, Jiro-maru, arrive. Jiro-maru proudly unveils his "Saber 600," boasting of its superiority and stirring Go's competitive fire.

Inside the stadium, a sprawling, intricate track designed for extreme endurance silences the racers. The Mini 4WD Fighter details the grueling 80-lap race, emphasizing the single battery change allowed after lap 50. Dr. Tsuchiya reinforces the data-gathering objective, and the mandated use of uniform batteries frustrates Fujikichi. This ensures a level playing field, testing pure racing skill.

In the preparation area, Ryo Takaba advises Jiro-maru on sportsmanship, unaware of the impending mistake. Jiro-maru, eager to impress, accidentally uses his race batteries during warm-up. Panic-stricken by his blunder, he eyes Go and Retsu's unattended toolboxes. In a desperate, guilt-ridden act, Jiro-maru swaps his depleted batteries for Go's fresh ones.

The Mini 4WD Fighter announces five minutes to race time, intensifying the pre-race chaos. Ryo notices Jiro-maru's evasive behavior, sensing something amiss, but the call to line up interrupts his thoughts. Go, battling his worsening fever, splashes water on his face, then forces a brave front for Retsu. The machines are placed, the countdown begins, and Jiro-maru's Saber 600, powered by Go's stolen batteries, rockets into an immediate lead.

Jiro-maru maintains his early lead, his Saber 600 performing flawlessly. Go struggles, his Magnum feeling sluggish, the sabotaged batteries already fading. In the control room, Dr. Tsuchiya notes Jiro-maru's unsustainable speed and Fighter points out Go's unusual underperformance. The field stretches out as the race progresses, Retsu's Sonic and Fujikichi's Spin Axe locked in a battle for second, while Ryo's Tridagger patiently holds back.

Go's fever continues to worsen, his focus wavering as he urges Magnum forward. Jiro-maru, still in the lead, begins to falter, his guilt manifesting in small mistakes. Further back, Fujikichi's arrogant attempt at a high-speed overtake ends in disaster, his Spin Axe crashing violently. He rages at the track and his staff, his easy victory dreams shattered by overconfidence.

Ryo's Tridagger accelerates as the 40th lap approaches, his disciplined power management paying off. Dr. Tsuchiya and Mini 4WD Fighter anticipate the pivotal battery change. At lap 50, Retsu's Sonic executes a perfect pit stop, rejoining the race revitalized. However, Go's Magnum stalls just before the pit, its power completely exhausted, and Go collapses, his fever finally overwhelming him.

Jiro-maru, overcome with guilt at Go's collapse, confesses his battery swap to everyone present, including a shocked Ryo. Ryo then reveals he had suspected Jiro-maru's actions and secretly replaced Go's drained batteries with his own fresh set before the race. Fujikichi attempts to use the scandal to his advantage, but Dr. Tsuchiya sternly permits the race to continue, emphasizing integrity above all.

Re-energized and fueled by renewed determination, Go's Magnum joins Retsu's Sonic and Ryo's Tridagger in a fierce three-way battle for the final 30 laps. As they enter the last lap, neck-and-neck, Go unleashes his signature 'Magnum Tornado' on the final jump. The car spins through the air, leaving the others stunned. The machines cross the finish line in a blur, making the winner impossible to discern by eye.

The results are announced: Retsu's Sonic takes first, Go's Magnum a close second, and Ryo's Tridagger third. Despite the loss, Go finds satisfaction in finishing. Afterward, Jiro-maru tearfully apologizes to Ryo, who reassures his brother that his confession proves his true racer's heart. As the sun sets, the four boys depart together, a shared respect forging new bonds of friendship and rivalry, with Go's fever finally broken.