Doodles of the Past 1

What's this? Some kid's doodles? But it looks so familiar...

I made these doodles when I was a kid! I can't believe they're still here...

There should be more doodles somewhere... Was it in 都心西側境界? Should I look for them?

I should stop wasting my time.

There are doodles here, too. It looks like they wanted to be found by someone. Maybe they contain some sort of meaning.

...Meaning?