The Good News (Gospel): Jesus The Christ is King
The core of the gospel ("Good news") is that Jesus is King, that his resurrection declares he is "the son of God in power", and all people are called to trust in Him and accept his rule.
The gospel comes with a house key
"The gospel comes with a house key," shares Jylan and Nathan as they are commission to serve God in Japan as carriers of the Good News of Jesus Christ.