- Hisahito Mizuki
- Swing Charm flat
Days follows the struggles of Tsukushi Tsukamoto, a shy, clumsy and bullied teenager about to start high school. He manages to make it to the soccer team despite being incredibly frail, weak and clumsy thanks to his continuous efforts and amazing perseverance, and further he shows incredible ability in motivating the rest of the team to work as hard as possible.
Shuuji Narukami (成神 蹴冶, Narukami Shuuji)
Narukami is the other main character in Yasuda's previous manga "Furimukuna Kimi wa." His duo with fellow genius football Indou has made their school, Sakuragi Academy, become a National stronghold. A short and frail guy, who was unable to play soccer before high school due to his bronchial asthma, he turns into a different person while playing, to the point of becoming bullish and arrogant. He's a superb forward, incredibly fast and precise. Tsukushi holds Narukami in great regard, due to his skill despite being as short and frail as he himself is.