How do I get a 6 month Visa

My girlfriend is really likely to get an internship in Tokyo for around 5 months next year. I want to go with her since we really don't want to be seperated for 5 months. So my question is how can I get a visa for longer than 5 months? I am open for all options.

Some relevant information about us:
Me and my girlfriend are both from the Netherlands, Europe.
We are in our mid 20's
My girlfriends internship will be at an English Company in Tokyo
I don't know what kind of visa she will get.
The internship will start in September of 2025

If more information is needed I will edit this post.

Thank you in regard

by JapanTraveler9000

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