Clock Zero- Shuuen no Ichibyou- Devote

Sixth-grader Nadeshiko Kuze, longing to grow up, lived an ordinary life until she started having strange dreams. As new encounters arose in her school life, the things in her dreams began to encroach upon the real world, and the wheels of fate began to turn.

—— I don't want a world without you.
 
　　Autumn, 2010.
 
　　Nadeshiko Kuze, the protagonist, is a sixth-grader at the elementary school division of the private Shurin Academy in Tokyo. She had been living a relatively peaceful school life with her childhood friend, Riichiro, but at some point, she started having strange dreams almost every night. The dream world was desolate, oppressive, and gloomy, with red and blue colors intertwined in the dark sky —
 
　　One day, the new teacher, Asahi Koga, called Nadeshiko and Riichiro.
 
　　Also summoned to the classroom were problematic students from other classes and students from lower grades, totaling six people. There, the teacher announced to them, "I have prepared an assignment for you problematic students."
 
　　The hastily formed group had no choice but to cooperate with their companions to complete the "assignment" given by the teacher. Although school life was filled with worries, it was also incredibly fulfilling. However, behind it all, many mysteries were gradually encroaching upon "reality."
 
　　Nadeshiko was disoriented by the current situation, and at this moment, someone she had seen in the "dream world" appeared before her.
 
　　After encountering "him," who seemed familiar, the wheels of fate began to turn —