You can buy it on
https://www.coinexchange.io/ for bitcoin. If you don't have bitcoin or you want to buy it fast you can transfer here ltc or eth and exchange it for bitcoin. Then you can buy brother coin for btc.
Is there any bounty campaign or airdrop from brother?
The ICO project has already been completed. Accordingly, the Bounty campaign is completed. However, now you can buy the project tokens at a very favorable price on the exchange.