Forbidden Love ( Imouto de Ikou ) Episode 2 - Thanks, my Brother

When her family is overthrown in a coup d'état, Princess Mayuka is sent to Earth to recharge the Ultimate Weapon. After studying the mating behaviors of Earthlings, she decides to enlist the help of one of her research subjects, college student Yoshizumi, but crash-lands on his roof. Taken hostage and shot with her own gun by Yoshizumi, she is brainwashed into thinking she is his younger sister. Fortunately, Yoshizumi grows fond of Mayuka and decides to help her with her mission: to awaken the powers of Akiho--the red-haired, green-eyed, appetite-driven Ultimate Weapon--using "primitive stimulation"

In an attempt to save my mother's Kingdom back on my home planet, I'm here on planet Earth to awaken the ultimate weapon our people hid here years ago. Our weapon was made in the form of a girl and its powers can only be activated by sex! My brother, Yoshizumi, is willing to activate it - with our help! Different sisters cause different drama! Can we save my planet from overthrow ? Watch and see!

Enjoying hiding out on Earth, Mayuka runs into some trouble with Yoshizumi and then has to deal with an even bigger problem.

Forbidden Love ( Imouto de Ikou ) Episode 2 - Thanks, my Brother