Rumina Ayukawa, a timid primary school student enduring relentless bullying, is pressured by classmates to confront a combat-skilled high school student. Despite his boxing knowledge and paralyzing fear, he reluctantly agrees. Overpowered in the encounter, he is brought to the older student’s home, where he trains in shadowboxing—a specialized technique combining advanced visualization with illusory yet visceral combat simulations. Through mental projections of adversaries like a legendary heavyweight champion and a colossal praying mantis, he observes strategies blending Chinese Kenpo’s animal-inspired tactics with precise weak-point targeting.

The high school student’s guidance unveils motivations tied to surpassing a parent famed for defeating a Giant African Elephant, deemed Earth’s strongest creature. Rumina’s exposure to these unorthodox methods—fighting spirit visualization, adaptive martial arts—slowly shifts his understanding of combat, intertwining psychological resilience with technical skill. His journey, framed by bullying’s pressures and a mentor’s unconventional pedagogy, charts incremental growth in confronting fear, emphasizing resolve and the mental dimensions of martial mastery.