Junhei Oda is the older brother of protagonist Ryuuhei Oda. During their childhood, Ryuuhei deeply admired Junhei for his kindness. Junhei perished mysteriously in an incident witnessed firsthand by Ryuuhei during elementary school. This traumatic event profoundly impacted Ryuuhei, though he later presents himself as a cheerful high school student. The circumstances surrounding Junhei's sudden and enigmatic death remain unexplained. This incident forms a foundational element of Ryuuhei's backstory, indirectly catalyzing his eventual encounter with supernatural entities following his brother's death.