Haruka finds a cat in an abandoned building and names it Nyan. Little does she know that this cat is actually Ultra-Nyan who has come from outer space. Using his mysterious powers, Ultra-Nyan helps Haruka and her friends foil the plans of a couple of no-good catnappers.

Japanese rock band Ziggy comes to London and gets attacked upon arrival at the hotel after a recording session. The musicians barely escape the attack; however, soon they learn that their producer has been murdered, and they are the suspects! Chased by police and some mysterious organization, they find shelter at a local rockers' place and even give a performance there; but it is not too long before their pursuers appear again. (Source: AniDB)

They always steal the prey they aim for. That is Phantom Thief Queen. Gender, age, nationality unknown. Together with their partner Joker, RD, they travel around the world on the airship Troubadour. This time, the Queen is aiming for a cursed jewel, the legendary Rose of Linden. A hypnotist, an acrobat, a magician...the talented circus members challenge the Queen! What is their purpose? In order to get back the jewel, the Queen stands up to the challenge in a bold and brilliant way (or disguise). Nothing is impossible for the Queen! (Source: HIDIVE)

The anime follows a group of friends Giulia, Maria, Enrico, Lucio and Angelo during the Seveso disaster as they team up with a Japanese journalist Shirou Andou, and begin their own investigation of what's occurring (during the week long period of exposure when the ICMESA refused to notify citizens of the poison). As many animals are dying and people are getting sick. The children and Shirou discover deadly dioxin was released and inform Enrico's father, the town mayor, who evacuates all the citizens. Shirou continues investigating more and learns of the negligence of La Roche, a company who controls ICMESA. La Roche knew they were in violating of existing safety laws/protocols and destroyed evidence of their crimes. The children attend a press conference to ruin La Roche's reputation as the destroyed proof might not be enough in a court of law to punish them.