So Matsutaro got scouted and reluctantly decided to do sumo in Tokyo. But he never wanted to do sumo in the first place, so his motivation-level is zero. He refuses to wake up for morning training. He even slugs his senpai in the end. But the professional sumo-wrestler Inokawa steps in to teach Matsutaro a lesson.
perhaps he can't help having an inflated ego.
ein aufgeblasenes Ego entwickelt hat.
quizás no pueda evitar 
tener algo inflado el ego.
quizás no pueda evitar 
tener algo inflado el ego.
é natural que ele tenha um ego inflado.