Swimsuit Samurai

A strange virus has spread throughout Tokyo. The people infected lose their minds and transform into monsters. They seek only to fulfil their desires and assail people left, right, and center. Under such harsh circumstances, you face trial and tribulation, and escape to see another day. Along the way you meet 3 girls. In self defense, they arm themselves with guns, and you combine forces to fight against all odds and survive.
Using an abandoned school as your base of operations, you fight against the infected, repair your base, and help others who too have survived... but in the end, will you and the girls make it through this ordeal alive...?