Many years ago, I gave about 90 days or so to studying Japanese.
I used Pimsleur for 30 days or so, as I had no idea what Japanese sounded like. I think that this approach will give you good pronunciation practice. These days you can probably just use online videos for pronunciation. As I worked through those tapes, I used Heisig's Remembering The Kana to learn the basic writing systems, Hiragana and Katakana. Which you are going to need because:
The book Japanese For Everyone is quite good, but tough. I think the Romaji are gone by chapter three or so and you are left reading the kana. The kanji characters are introduced slowly, with furigana, about this same time. I cannot say how much / many kanji they have, as I quit studying right about there. I didn't have the audio back then, but I expect that the JFE book is even better, now that those audio files are available over the net. And there is an answer key in the back.
Genki, Minna No Nihongo, and Japanese for Busy People are all popular, but I have no experience with them. I understand that at least one of them makes you buy a Teacher's Text if you want the answer key. Not cool, in my opinion.
It seems to me that Assimil is best for related languages, as people have suggested. But the dialogues should be *almost* easy to follow, that is how Assimil works. If you just want some audio to shadow, I think that Cortina released the Japanese audio from its older course, but I don't remember for sure.
Regarding the yojik website, I had some trouble with it lately; perhaps this link will get you there. (I hope it works.)https://yojik.eu/languages/FSI/fsi-japanese.html
P.S. Probably the best advice (and this goes for me, too) is to get off the interwebs and go study! ha ha!