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“Blueprint Control.”

In case there was any danger, I used Blueprint Control first, then cautiously approached and picked up the diary lying on the floor.

“...Whose is this?”

There was no name written on it, nor any indication of the owner's identity on the cover.

But there was one reason I could recognize it as a diary at a glance.

[Diary-]

It was the crooked handwriting someone had scrawled across the front cover.

“Did someone go camping in the middle of the subway tracks...?”

A folding chair and a sleeping bag.

They were unmistakably signs that someone had been staying here. And if there was a diary, that clinched it...