The Great Sword in the Moon

My name is Tohsaka Yu, and my current identity is the second son of the Tosaka family in Fuyuki City in the Moon World. My elder sister is Tohsaka Rin, and my younger sister is Tohsaka Sakura. As a time traveler, a system is naturally indispensable. My system is called the Great Sword System. It gives me an ability, the power of the Great Sword. This ability is very vulgar, turning me into a humanoid self-propelled drug. Every girl I come into contact with will fall into some indescribable situation. During the shape month, I did a few little things. The first one was to kill a certain old bug from the Matou family. The second one saved the lives of miserable girls such as Kallen, Asakami Fujino, and Kohaku. The third one is to enable the male protagonists and male supporting characters to lead a free single life. I feel ashamed that I did something trivial. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.