My parents left this world when I was little. I had a sister who was very close to me when I was little. I was sad, but I couldn’t say that to her. When I saw that she didn’t understand the situation well, I thought that I, as the older brother, should be prepared for it. But the determination of a child is of no use to me. The two of them spend a few days together with the support of their neighbors until they decide on a place to live.

Then comes the time to say goodbye. The older brother regrets that he couldn’t do anything about it, even though he had decided to protect it. As they are about to say goodbye, he makes one last promise to his brother.

If you ever grow up and have a bad day, you can count on your brother!　I’ll get you out of there, I promise! Yes, I promise…

A brother and sister twirl their little fingers and cut their fingers off. When the finger cutting is done, they go their separate ways, crying to each other.

[And then the time goes by – Reunion with my sister] I’m attending a college nearby, and I’m a sophomore this spring. Right now I’m on spring break and have nothing to do in particular and have a lot of free time on my hands. I vaguely recall the content of my dream, “But I haven’t dreamed about my sister in a while. He wonders if she is doing well, even though they were separated about ten years ago. In the meantime, he realizes that it’s almost dusk. On his way to the shopping mall to buy dinner, he meets a cute girl.

I think she looks like my sister… Maybe it’s just because I dreamed about my sister…. The image of my sister on the day of our separation overlaps with the girl who is walking away from me, and it makes my heart ache for some reason.

On the way home, he bumps into the girl he saw earlier at the corner. The protagonist is puzzled, but she looks at you and asks you “Onii-chan…? And a girl. His voice and the sound of his voice, and most importantly, the word “big brother” convinces him that she is the sister he is going to live with apart. They look at each other, forgetting that it’s raining. As they do so, tears slowly start to accumulate in Koharu’s eyes, and she finally bursts into tears.

”Uh, no…….I’m so happy to see my brother…….”

The rain was getting heavier, so I decided to take my sister home for now. He tries not to worry about his brother, but he’s worried that he won’t be hated or something. When he finds out how his sister feels, he vows to protect her again. They’re going to step out to preserve a lot of memories of being together for the amount of time they’ve been apart.