Imouto de Ikou!

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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".

(Source: Anime News Network)
Anitummy is a site to watch online anime like Imouto de Ikou! online, or you can even watch Imouto de Ikou! in HD quality
Overview:
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".

(Source: Anime News Network)
Other names: Plenty of Pretty Sisters,Forbidden Love: Plenty of Pretty Sisters,Sentiment défendu
Aired: June 26, 2003 to September 25, 2003
Episodes: 0
Premiered: SUMMER
Duration: 30m
Status: Completed
Genres: Hentai
Anitummy is a site to watch online anime like Imouto de Ikou! online, or you can even watch Imouto de Ikou! in HD quality