Is the Northern Kyushu Pass worth it?

I am planning to go to Fukuoka this March for 5 days and looking at purchasing the Northern Kyushu Pass, is it work it?
I plan to go to the following : Yufuin (hopefully get the Yufuin No Mori train), Nagsaki or Kumamoto and the Tosu Premium outlets.

Your comments/suggestions is highly appreciated. Thanks in advance.

It is one of the better passes that pays off relatively easily.
It would pay off for your purposes compared to regular tickets.

However, Kyushu has a lot of discount tickets, such as the ２枚きっぷ and ネットきっぷ, which can save you considerably, but they are difficult to understand for people without Japanese reading skills.

Please provide an itinerary. Not just locations.

@Uji, I am not sure that we can buy a ネットきっぷ without being a Japanese resident.

Most discounts do not show up when searching for an itinerary on the English version of JR Kyushu.
And when trying to create an account on the Japanese website, the terms and conditions state the following:

次の各号の1に該当することが判明した場合には、当該会員希望者の登録を承認しない、または取り消すことができます。(...)
(2) 会員希望者が日本国外に居住する場合

I forgot to mention that the ２枚きっぷ and other 駅で買える tickets don't seem to have any conditions associated.

I got an answer from the JR Kyushu website team (they were super fast!):

Unfortunately, only regular tickets can be reserved on the JR KYUSHU Train Reservation website.
Discount tickets such as the “KYUSHU NET KIPPU ”are available through the "JR 九州インターネット列車予約サービス"
(Japanese only).
However, the "JR 九州インターネット列車予約サービス" is only available to customers residing in Japan, as it requires registration of a Japanese address and telephone number.

About the other tickets:
2枚きっぷ(nimaikippu) can be purchased at JR Kyushu's Midori-no-Madoguchi counters and ticket vending machines at some stations.
However, we are unable to provide further details. Please understand.

Thanks for the update!

Beside JR kyushu northern area pass,you can buy SunQ northern area pass 3day: 9000yen
Unlimited travel by bus in oita,yufuin, fukuoka