In between houses for the next 3-6 months, does anyone know of any sharehouse vacancies?

Of course I've looked into the usual places, but reddit has been surprisingly helpful for this kind of thing in the house.

Essentially, my housemate is moving out (of the country) for the next 3-6 months. I'm not too interested in renting a 'real' apartment as I know the tend to have leases of 12 months+. On top of whatever other headaches renting in Japan entails.

Does anyone know of any decent places for sharehouses, or directly know any vacancies I can fill for the next 3-6 months? Thank you in advance!