There may be many Yo-kai Watch 4 users who don’t know the introduction of Yo-kai Watch 4++ key NFC function. Next is the "Yo-kai Watch 4++ key NFC function introduction" compiled by Sourcecode.com. Interested children, please take a look below. Hope it helps you.
Introduction to key NFC functions
After reaching the third chapter, go to the inner world and unlock the key app. Then you can scan with NFC and get various things. The white key can only be scanned once, and the monsters that will usually appear can only be scanned once. Others can be scanned every day. Scan it once, you will know the details after scanning it.