[Sangetsu]

It sounds like the usual deal, with the exception of the 6 month contract (most labor contracts in Japan are 1 year in length).

There are worse places to work than Interac, but on the other hand, you will have little or no choice regarding where you will live and work (regardless of what they say). Without experience, you won't find a better deal with any other company. If you really wish to experience Japan, you should accept.