Action, Comedy, Fantasy, Shounen, Drama, Gender Bender

Nana, young boy with amnesia, has forgotten even his name. During one of his journeys, he is powerless to protect two children who are killed during an attack on a village. After the horrific experience, he resolves to eradicate war from the earth. He then joins Tripeace, a small group of activists who are willing to use any means necessary, even violence, to end war. Should peace be protected whatever the cost?