When I went to Fukuoka as a business trip I used the Sakura lounge in Haneda airport(HND) for the first time.
The lounge is just going through the security gate dedicated to those who are Oneworld elite members.
You can just put your boarding pass to the QR code reader.
I took a video of the lounge :
There are quite a lot of drinks, including alcohols, but no foods there.
Unlike the ANA lounge in Haneda, there is a “Kids lounge” in here.
Inside is like this :
I think it is very good for families.
For your information you can enter there by paying for JPY3,000.
How to connect to Wi-Fi
You can select ‘jal’ SSID.
No password is needed.
Then click(tap) “START”.
After reading the terms and conditions, ticking 「同意する」(“agree” in Japanese) and click(tap) 「次へ」(“next” in Japanese).
Fill in your email address.
Click(tap) 「同意する」(“agree” in Japanese), then it’ll be connected.
Uploading : 4.61Mbps
Downloading : 3.41Mbps
It had good speed.
There are some like private spaces so that we can relax.
I think the lounge in ANA(NH) is different from this lounge, it is more business-suitable there.