4 months in Japan: would you use one eSIM, a local plan, or mix both?

For a short trip, an eSIM is easy. For four months, the answer gets more interesting.

If you were studying in Japan for a semester and also planning trips to Korea or China, would you:

• keep one travel eSIM the whole time
• get a local Japanese plan and use eSIMs for side trips
• use a regional plan
• mix everything depending on the month