Five Star Gift Ideas

Great! Here are some gift ideas that might work well for your J-pop-loving granddaughter:

1. J-pop concert tickets - if there's an upcoming J-pop concert in your area or one that she can travel to, getting her tickets would make for an unforgettable gift that she'll always remember.

2. J-pop merchandise - there are plenty of websites that sell official merchandise from Japanese pop groups, including t-shirts, posters, and even makeup. You could also look for Japanese fashion accessories or beauty products that match her style.

3. Language learning materials to learn Japanese - if your granddaughter is learning Japanese or wants to learn, she might appreciate some Japanese language learning resources such as a language textbook, audio lessons, or even a gift card for an online language learning platform.

4. Care package with Japanese snacks and goodies - put together a care package of popular Japanese snacks or sweets such as Pocky or Hello Panda, along with small J-pop trinkets (keychains, stickers, etc.) and other cute Japanese things like stationery or plushies.

5. J-pop karaoke set up - if you have the space and budget, consider setting up a small karaoke system for your granddaughter, complete with J-pop songs she loves. This way, she can practice her Japanese and have fun singing along to her favorite tunes.

Or you can get her a star map with an important date you share.