Shinobido 2: Revenge of Zen PSP Vita. Shinobido 2: Revenge of Zen is the sequel to Shinobido: Way of the Ninja, featuring the series' trademark stealth action gameplay with the addition of new stylish assassin moves and a dynamic storyline. Developed by Acquire, the story is set six months after the events of the previous opus. The Utakata region is once again at the center of the storm and embroiled in a civil war involving the mysterious Tenma Mirrors, rumored to have magical properties. Players will take the role of Zen, a man who has suffered betrayal at the hands of his companion and the loss of his home. Saved by the Asuka clan of Utakata, Zen makes up his mind to live as an assassin and begins a perilous journey in search of revenge.