No most people live their parents and they have smaller homes then in the USA and europe. This has lead to the the cafe, love hotels (hotel renting by the hours), and the pc bangs( those stores you see renting out gaming computers). So if you want time alone you can go to those it is not uncommon in residential areas to go to cafes and groups of women and men chatting away while the kids play on the floor with their toys.
Currently with the higher heat lots of people are spending their time in the cafes.
Price wise they are not bad you can get a drink in the US $3-$4 range, if you want something sweet those are usually in the US $5-$7 for these smaller cafes. Starbucks is a few dollars more.