How about a minimal-sized study that includes a desk, chair, and cupboard? Before you lament that you don't have the space for a study, take a look at this desk unit called "Kakureya. It is sold at COZY ROOM, a furniture retailer.

Place this desk unit in the corner of a hallway or in your garage, and you will instantly create your own personal space.

It is made to order and will be delivered in about three months from the time of order. The price is a bit on the high side at 798,000 yen (tax included).

Simple study with just a desk, chair, and shelves
Simple study with just a desk, chair, and shelves

Note: Photo from COZY ROOM website