"I Can" centers on a group of high school students navigating the challenges of adolescence while pursuing their dreams and overcoming personal struggles. The protagonist, Haruto, is a reserved yet determined teenager who discovers a hidden talent for running after joining the school's track and field team. His journey is marked by self-doubt, rivalry, and the pressure to excel, both academically and athletically. Haruto's growth is paralleled by the experiences of his teammates, including the confident but emotionally conflicted team captain, Akira, and the fiercely competitive yet insecure sprinter, Yuna.

The narrative explores themes of perseverance, teamwork, and self-discovery as the characters face setbacks, injuries, and interpersonal conflicts. Haruto's relationship with his coach, a former Olympian with a troubled past, adds depth to the story, as the coach's mentorship helps Haruto and his teammates confront their fears and push their limits. The series also delves into the personal lives of the characters, highlighting their struggles with family expectations, societal pressures, and the pursuit of individual identity.

As the story progresses, the team prepares for a national championship, which serves as the culmination of their efforts and a test of their resilience. The series balances intense sports action with emotional moments, creating a compelling portrayal of the highs and lows of competitive athletics. Through its focus on character development and realistic challenges, "I Can" offers a nuanced exploration of ambition, friendship, and the pursuit of excellence.