Answering over here since it’s kind of off-topic in the other thread.
Nice! And if you’re already reading よつばと! - L18 and L21 isn’t that far apart anyway.
And as long as you are using the language actively, don’t worry too much about forgetting burned things. Unless you’re taking a test, occasionally looking up things you “should” know isn’t the end of the world, and then it’ll be part of your memory again. You’ll (hopefully!) learn most of your words outside of SRS anyway!
I searched a bit and couldn’t find one. Not that surprising though, considering the manga came out just last year.