ET comes from Mars to the Earth. Here he is brought home by Xiao Bo who is very attentive to ET, enthusiastically showing him what the Earth looks like. Xiao BoŠs girlfriend, not managing to distract the boy from ET, decides to get revenge trying to have a mixed earthling-martian baby with ET. But ET ends up losing consciousness and is then awaken by Xiao Bo, come to his rescue. ET, who survives merely on sunlight, never taking any food or drink, gradually experiences various aspects of life on Earth, learning how to love as well as what the physical limitations of humans are. On the eve of his return to Mars, ET uses the ultimate human way of expressing love and makes love to Xiao Bo. Not long after ET has left the Earth, Xiao Bo, who was "infected" by a certain Martian quality during lovemaking, comes back to where they first met, and discovers the way to Mars. .