You are a ninja. 

You have been given the mission of infiltrating the samurai military organization to eliminate to the shogun who is imposing dictatorial rules. The shogun as the ability to rule the country. 

The shogun as a lair in a stone tower medieval where he is escorted by samurai. The mission is to infiltrate through the underground waters, climb the tower, kill the guards and crumble tower. Deteriorate the shogunate clan. 

It's my first project so enjoy it. Patience if you wants to see my other projects. I'm starting on this.