Yuna Yuki is an ordinary middle school student. But there is one extraordinary thing about Yuki-she belongs to the "Brave Hero Club." What does this club do? Who is "Vertex?"Yuna Yuki is an ordinary middle school student. But there is one extraordinary thing about Yuki-she belongs to the "Brave Hero Club." What does this club do? Who is "Vertex?"Yuna Yuki is an ordinary middle school student. But there is one extraordinary thing about Yuki-she belongs to the "Brave Hero Club." What does this club do? Who is "Vertex?"
