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:
βPS1 - Region Locked
βPS2 - Region Locked
βPS3 - Region Free
βPS4 - Region Free
βPS5 - Region Free
βN64 - Region Locked
βGamecube - Region Locked
βWii - Region Locked
βWii U - Region Locked
βNintendo Switch - Region Free
βGameboy - Region Free
βNintendo DS - Region Free
βNintendo 3DS - Region Locked
βSony PSP - Region Free
βSony PS Vita - Region Free
βSega Game Gear - Region Free
βPC Engine HuCard - Region Locked
βPC Engine CD - Region Free
βSega Mega Drive - Region Free
βSega Saturn - Region Locked
βDreamcast - Region Locked
βXbox - Region Locked
βXbox 360 - Region Locked (some exceptions)
βXbox One - Region Free
βPanasonic 3DO - Region Free (some exceptions)