Sentou Gakuen is the very first Online Visual Novel that is combined with MMORPG elements.
In Sentou Gakuen, players are free to choose their own path. They can just study and work, do bad things at school, protect the weak, or exploit their weakness. Spend money to help friends or horde it for themselves. Form a club and become the most respected group of students in the school. Declare war on an enemy, or an innocent bystander.