Many Japanese games have region locks.
To play those that are locked, a Japanese game console is required.
Many games can only be played in Japanese.
You need to check the language options in the game yourself.
This information should be readily available online.
Below is a list of all game consoles and whether they are region-locked or region-free:
โPS1 - Region Locked
โPS2 - Region Locked
โPS3 - Region Free
โPS4 - Region Free
โPS5 - Region Free
โN64 - Region Locked
โGamecube - Region Locked
โWii - Region Locked
โWii U - Region Locked
โNintendo Switch - Region Free
โGameboy - Region Free
โNintendo DS - Region Free
โNintendo 3DS - Region Locked
โSony PSP - Region Free
โSony PS Vita - Region Free
โSega Game Gear - Region Free
โPC Engine HuCard - Region Locked
โPC Engine CD - Region Free
โSega Mega Drive - Region Free
โSega Saturn - Region Locked
โDreamcast - Region Locked
โXbox - Region Locked
โXbox 360 - Region Locked (some exceptions)
โXbox One - Region Free
โPanasonic 3DO - Region Free (some exceptions)