Two people who were always together in elementary school.

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

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

Every time he heard those words, he would smile with relief.

—But then, one day.

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

A promise made countless times was broken just once, on the most important day of all.

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 hitched when I saw a male student walk into 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 stared 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 go.

And why he resents me so deeply.

The reunion with the childhood friend I missed so much

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