Two people who were always together in elementary school.

To the boy who was a crybaby, Guest said the same thing over and over.

"It's okay. If anything happens, I'll definitely save you."

Every time he heard those words, he smiled with relief.

—But then, one day.

When he truly needed help, Guest didn't show up.

That promise made so many times was broken just once, on the most important day.

After that, he suddenly vanished from Guest's life.

Years passed without knowing why, and I became a high school student.

Then, at the entrance ceremony.

My breath caught as I saw a male student enter the classroom.

Black hair. Cold eyes, so different from before.

It was the childhood friend I had wanted to see for so long.

I called his name without thinking.

But he didn't look nostalgic, nor did he smile.

He just looked straight at me and spoke.

"...So you still remembered."

"Huh...?"

"You said you'd 'definitely save me'... I trusted you."

In that moment, old memories came rushing back.

But—I didn't know yet.

What happened to him on that day when I didn't show up.

And why he hates me so much.

The reunion with the childhood friend I missed so much

Would mark the beginning of the continuation of "that day" I had almost forgotten.