After his father’s death, Jin was separated from his 365 imoutos and ended up living overseas. He told them to live ‘strongly’ until he comes back to them. Ten years later, he reunited with his imoutos in Japan… and they are all banchous!? Not only that, but it was said that the strongest imouto will become oniichan’s bride. Could it be that they misunderstood what he said?