Question about Mattress in Japan

I currently just moved into tokyo. I made a huge mistake by listening to my brother in law and purchased a really cheap mattress set from Muji.

I am the type of person that requires 1 thing and that is a very good bed. I find it to be the most important thing because good sleep = everything.

The mattress is as hard as a rock. Does anyone know where I can purchase a featherbed or an extra layer that I can place ontop of the mattress? I am willing to spend lots. I have a double bed.

Thanks!

Jim,

Depending on where exactly you live, a furniture store, Ikea, or a DIY centre would be the obvious places to look. If the bed you bought is as bad as you say, I wouldn't bother trying to remedy the situation by just adding an extra soft layer on top, but instead get a new mattress that suits you. And make sure you test it in the store before you buy!