Gianna, nicknamed the Bullet Saint who serves the heavens, is a voluptuous, powerful, busty sister! We've received information that villains are using an item that can use magic to commit target! We have to do something before the damage gets too bad!! Gianna is a powerful busty sister!! She will never be captivated by magic!!! Together with her senior, busty sister Kyoka, defeat the villains and solve the case!!