I'm thinking they're Chinese or Korean medals, I could definitely be wrong so wait for others to chime in!
I wish I had them in my possession. My grandpa was about to give these to me today during my morning coffee visit. He doesn’t know what they are. I’m very fair to him and told him I wanted to look them up first. But I can’t find any references online. I tried to take them out of the case but they are in there really good and I didn’t want to damage it! I will get a better picture next weekend (and maybe take them home this time).
Yes you're right, could definitely be Japanese, whether it's for the Olympics, idk. @AustinJ0324 Next time you see the set, try to pull out the red wrapper from the box and you should be able to push the medals out. At least that's how most boxed medals are set up. Could be a gold medal but you'll never know until you look and post better pics here! You won't damage it if you're careful but sometimes the red wrapper has a small amount of glue on it from the factory, you're probably gonna have to use some force but it's the only way to get information!
I think it looks like a commemorative set. Not challenge coins, as both would carry the same inscriptions and artwork, even though one was silver & the other gold.
It looks mainland Chinese to me. I am having a really hard time reading the characters from these photos though. I can see 贰拾 (20) in financial script on the gold one. If you get a photo with less reflections focused on the coin I can transcribe and look up the rest.