Well it's hard for me to recommend anything since I don't really know much when it comes to shopping in Japan loll.
But here's my attempt.
MX250 is a pretty weak sauce GPU for that amount of money. You can get a dell G3 with very similar specs but an Nvidia 1650 for 130,980 which will smoke the MX 250 from Dell's website.
Another one would be from amazon: ROG Zephyrus G (Ryzen 7 3750H/GTX 1660 Ti Max-Q/16GB・SSD 512GB)
The CPU is a bit worse but the build quality, GPU and battery life are very good. It might not come with a webcam however.
The last thing I would recommend is try to see if you can find a laptop with Ryzen 4000 series CPU like the Asus G14. Those are very similarly priced to laptops with the i7 9750H but will give you 8 cores 16 threads instead of 6 cores 12 threads.Last edited by Captain_Yuri - on 18 April 2020