Rui is a mysterious person who causes some troubles in a futuristic city of Tokyo. He was walking around in the city while someone (Tsukasa) was spying on him from the top of the building... looking at what Rui is gonna do and patiently waiting

Rui on the other side he didn't notice someone spying on him from the afar and he decided that he would cause some troubles around the city with his mini flying pet