Kakeru Naruse

Kakeru Naruse is a reserved student living under the weight of grief and self-blame following his mother's death. His life changes after receiving a mysterious letter from the future. Though quiet, Kakeru connects with Hiroto Suwa and Naho Takamiya through shared interests like gaming. He is the fastest runner in his class, yet he struggles with deep depression and suicidal ideation, fearing that his emotional struggles will burden those around him.