Jijou wo Shiranai Tenkousei ga Guigui Kuru.

Fifth grader Akane Nishimura, known by her classmates as the "Grim Reaper" due to her quiet demeanor and intimidating gaze, finds herself isolated and bullied at school. Her reputation as a bringer of misfortune makes her a target until the arrival of a cheerful new student, Taiyou Takada. Unfazed by the rumors and drawn to the supernatural, Taiyou befriends Akane, intrigued by her nickname and unfazed by the tales that scare others away.

With Taiyou's boundless optimism and energetic approach to life, Akane slowly starts to overcome her loneliness. Their summer blossoms with adventures, from swimming at the local pool to chasing fireflies, which helps forge a deep and transformative friendship. This new bond not only brings joy to Akane's life but begins to dispel the dark cloud of her "Grim Reaper" image as they explore the true meaning of friendship and acceptance.