中学校に馴染めずにいた藤野一希(上田琳斗)は、父親が突然新しい母と妹を連れてきたこともあり、家庭での居場所も失っていた。一方、冴島直明(土屋陽翔)は小学2年生に進級し、「牧野先生みたいなお医者さんになる」と語るが、新たな不安も抱え…。そんな中、病気で生きる意味を見出せなくなった少女が牧野(松下洸平)の元へやってくる。病気だけではなく心も見ないといけないと、学校で知ったはずの牧野。彼らの「言葉にできないSOS」にどのように向き合うのか
One student, Fujino Kazuki, struggles to adjust to life in middle school. His sense of belonging is further shaken when his father suddenly brings home a new wife and stepsister, leaving Kazuki feeling lost at home as well. Meanwhile, Saejima Naoaki, who previously underwent heart surgery, is now in his second year of school. Inspired by Makino, he declares his dream of becoming a doctor like him, but hidden worries still weigh on his heart. Amid all this, Makino encounters a new patient at the hospital: a girl whose illness has returned and who has lost the will to live.
