I also don't think that the artist was using a tool to help keep their characters in line, since some of the columns are decidedly mis-aligned.
It's also using Japanese punctuation characters.
considers
It might be that there is no text-based form online, if the same person designed the thing and then did the brush work. Your best bet, if you want a text-based form of the image, as you say in your post, might be to re-create it manually in a text editor, using a monospaced font.
I don't know if you yourself are Japanese
you have a name that sounds Japanese to me
but if you can recognize the characters yourself, you might not have a hard time inputting them yourself. I don't know what that "h-with-a-squiggle" character at the base of the girl's hairline is, next to her cheek, though. Not a Latin character, and I don't think that it's katakana, either.
checks post history
Ah, okay, you do know Japanese, so you might already know a bunch of what I wrote, be ahead of me there.
EDIT: Ah, the "h with a squiggle" is hiragana.