Designer is
白幡英俊, rest are correct
Verification tip for booklets that do this: upload part of the booklet that you've positively identified to a site that can identify Japanese fonts (like
https://en.likefont.com/), and if you can find it you can use that to verify anything you're less sure about
:
https://en.likefont.com/font/16101145/. Doesn't necessarily help in the initial transcription if you can't find the character to begin with, tho