Sono Natsu wa Nidome no Seishun o

That summer, an author Yuizaki Nagisa received news of a death. Her beloved younger brother Kaede had passed away due to an accident.

Kaede's death felt unreal. Deeply depressed, her days passed on by. Then one day, Kaede's best friend approached her with a certain request.

He told Nagisa that her brother was a member of his school's theater club and that there was a script he planned to write.
He wanted Nagisa to complete that half-written script.

From that day on, Nagisa threw herself into the high school life that Kaede missed out on. As she went through her high school days for the second time, Nagisa discovered a side of Kaede she never knew.