* Akiya houses come with an agreement to reside. Not just be a summer home. Their goal is to repopulate the countryside.
* You have to cultivate any farmland that comes with the deed. You cannot sell it without special permission. There is a whole lot of paperwork to deal with such situations.
* Most old Akiya will have strong regulation not to change the frontage. It isn't permitted. Architecturally these have to be consistent. Building permits are very stringent.
* Land tax is levied the day from purchase - not from the day of moving in.
* Residents have to contribute to local development funds which take care of Matsuris etc. You like it or not, local government will knock on your door with a bill.
* Connectivity is poor. Cell reception outside NTT can be spotty. Internet is even harder.
* Language proficiency is a must. No one speaks English. Not even the local government officials.
* House will need a significant amount of renovation. With the stringent restrictions - anywhere between 100 & 200 grand (depending on the disrepair)
I eventually vetoed my SO's plan. For a little more (and lesser space obviously), we can live in Tokyo suburbs.