Based on the American cartoon, "The Powerpuff Girls." Professor Utonium and his son Ken are studying the strange Chemical X. When a mochi cake falls into the formula, it changes into Chemical Z. Ken fires a ray of Chemical Z at a glacier in Tokyo Bay, however that causes strange black and white lights to scatter. The black lights turn its victims into monsters, with emphasis on a black light hitting a zoo monkey and transforming him into Mojo Jojo. The white lights, however, aim at three normal girls, Momoko, Miyako, and Kaoru. This gives them the power to transform into superheroes, the Powerpuff Girls Z!

A boy gets involved in an accident when in kindergarten, horribly damaging his arm, but the doctors somehow manage to save it. Now, several years later, his arm seems to be becoming the focus of strange events as it turns out to be more than a normal arm. Meanwhile, a secret organizations is out to get hold of him and the power he possess.

The 2nd Chapter continues the story of Ryo Takatsuki and his companions' quest to discover the secret of the mysterious A.R.M.S. they all possess and what the future may hold for them. They now know where the answers lie but to get to them, they must fight a desperate fight of survival against a powerful military corporation that wants their secrets no matter what the cost. (Source: AniDB)

The stage is Ayanagi City, a city near the Japan Sea. It is a futuristic city that was built to carry out the recovery from the calamity caused by the "Apathy Syndrome" ten years previous. High school student Shin Kanzato with his little brother Jun, meet with their elder brother Ryou, who is the chief of the Ayanagi City Police, again after ten years. At that time, a series of strange incidents happen in Ayanagi City such as the crew of a submarine that suddenly disappears while in their submarine, or a spiritless symptom which disturbs the world after ten years, or the case of the inside out corpse where a student took on a cruel appearance. Ryou tracks down the organization behind the string of incidents, and having become involved in the incidents, Shin awakens the "Persona." (Source: Wikipedia)