If it helps, this link to a 1999 article from
catholic.net (which is a reputable web site I believe

) does list Our Lady of Akita as one of the approved Marian apparitions (scroll down) along with Fatima and more well known (and some other lesser known) apparitions. . .and it gives some good reasons why knowledge of the messages can be important to us as individuals. Certainly it appears John Paul 2 thought these private revelations could be helpful to many.
catholic.net/rcc/Periodicals/Faith/may-june99/Apparitions.html
Of course, no one is
obliged to have a devotion to Our Lady of Akita or Our Lady of Fatima, or to ‘know’ about them. . .but one also has to consider that what that means is that one can say, “I don’t really know or care to know about XX Marian apparition” but one cannot say, “I don’t accept it or anything about it.”
Since the Church has judged the apparitions ‘worthy of belief’ and containing
nothing against Catholic teaching, rejection of the teachings simply on the basis that "they’re private revelation so they have
no value’ is just plain wrong.
So many people can say that they don’t care to know the mesages of Fatima or Akita. I can’t call them** wrong** but there’s a provisio–
Provided the people who do not want to know or accept anything from “private revelation” are following and fully accepting ‘public revelation’, they are absolutely in line with Church teachings.
However, one cannot make the mistake of assuming that because something is mentioned in a ‘private’ revelation’, that it is only to be ‘employed’ by those who believe in the private revelation.
The revelations all call, for example, for prayer, and penance. These are things which we are all called to in
public revelation as well, not
only in private revelation. So to say that, "just because a Marian apparition spoke of having to do prayer and penance doesn’t mean that I have to do it, because apparitions are private revelations and I don’t have to believe’ would be specious reasoning, and dangerous as well.